diff --git a/src/Core/Entities/Collection.cs b/src/Core/Entities/Collection.cs
index fb7225fc20..8babe10e4c 100644
--- a/src/Core/Entities/Collection.cs
+++ b/src/Core/Entities/Collection.cs
@@ -1,15 +1,17 @@
 using System.ComponentModel.DataAnnotations;
 using Bit.Core.Utilities;
 
+#nullable enable
+
 namespace Bit.Core.Entities;
 
 public class Collection : ITableObject<Guid>
 {
     public Guid Id { get; set; }
     public Guid OrganizationId { get; set; }
-    public string Name { get; set; }
+    public string Name { get; set; } = null!;
     [MaxLength(300)]
-    public string ExternalId { get; set; }
+    public string? ExternalId { get; set; }
     public DateTime CreationDate { get; set; } = DateTime.UtcNow;
     public DateTime RevisionDate { get; set; } = DateTime.UtcNow;
 
diff --git a/src/Core/Entities/CollectionCipher.cs b/src/Core/Entities/CollectionCipher.cs
index d212ced514..d69a82f37d 100644
--- a/src/Core/Entities/CollectionCipher.cs
+++ b/src/Core/Entities/CollectionCipher.cs
@@ -1,5 +1,7 @@
 namespace Bit.Core.Entities;
 
+#nullable enable
+
 public class CollectionCipher
 {
     public Guid CollectionId { get; set; }
diff --git a/src/Core/Entities/CollectionGroup.cs b/src/Core/Entities/CollectionGroup.cs
index 05b38c0064..f7561f18ed 100644
--- a/src/Core/Entities/CollectionGroup.cs
+++ b/src/Core/Entities/CollectionGroup.cs
@@ -1,5 +1,7 @@
 namespace Bit.Core.Entities;
 
+#nullable enable
+
 public class CollectionGroup
 {
     public Guid CollectionId { get; set; }
diff --git a/src/Core/Entities/CollectionUser.cs b/src/Core/Entities/CollectionUser.cs
index de1a079d9c..6e1a111a67 100644
--- a/src/Core/Entities/CollectionUser.cs
+++ b/src/Core/Entities/CollectionUser.cs
@@ -1,5 +1,7 @@
 namespace Bit.Core.Entities;
 
+#nullable enable
+
 public class CollectionUser
 {
     public Guid CollectionId { get; set; }
diff --git a/src/Core/Entities/Device.cs b/src/Core/Entities/Device.cs
index 0f9b9f8a75..44929fa2db 100644
--- a/src/Core/Entities/Device.cs
+++ b/src/Core/Entities/Device.cs
@@ -1,6 +1,8 @@
 using System.ComponentModel.DataAnnotations;
 using Bit.Core.Utilities;
 
+#nullable enable
+
 namespace Bit.Core.Entities;
 
 public class Device : ITableObject<Guid>
@@ -8,12 +10,12 @@ public class Device : ITableObject<Guid>
     public Guid Id { get; set; }
     public Guid UserId { get; set; }
     [MaxLength(50)]
-    public string Name { get; set; }
+    public string Name { get; set; } = null!;
     public Enums.DeviceType Type { get; set; }
     [MaxLength(50)]
-    public string Identifier { get; set; }
+    public string Identifier { get; set; } = null!;
     [MaxLength(255)]
-    public string PushToken { get; set; }
+    public string? PushToken { get; set; }
     public DateTime CreationDate { get; internal set; } = DateTime.UtcNow;
     public DateTime RevisionDate { get; internal set; } = DateTime.UtcNow;
 
@@ -21,20 +23,20 @@ public class Device : ITableObject<Guid>
     /// Intended to be the users symmetric key that is encrypted in some form, the current way to encrypt this is with
     /// the devices public key.
     /// </summary>
-    public string EncryptedUserKey { get; set; }
+    public string? EncryptedUserKey { get; set; }
 
     /// <summary>
     /// Intended to be the public key that was generated for a device upon trust and encrypted. Currenly encrypted using
     /// a users symmetric key so that when trusted and unlocked a user can decrypt the public key for all their devices.
     /// This enabled a user to rotate the keys for all of their devices.
     /// </summary>
-    public string EncryptedPublicKey { get; set; }
+    public string? EncryptedPublicKey { get; set; }
 
     /// <summary>
     /// Intended to be the private key that was generated for a device upon trust and encrypted. Currenly encrypted with
     /// the devices key, that upon successful login a user can decrypt this value and therefor decrypt their vault.
     /// </summary>
-    public string EncryptedPrivateKey { get; set; }
+    public string? EncryptedPrivateKey { get; set; }
 
 
     public void SetNewId()
diff --git a/src/Core/Entities/Event.cs b/src/Core/Entities/Event.cs
index e666c76f76..2a6b6664c2 100644
--- a/src/Core/Entities/Event.cs
+++ b/src/Core/Entities/Event.cs
@@ -3,6 +3,8 @@ using Bit.Core.Enums;
 using Bit.Core.Models.Data;
 using Bit.Core.Utilities;
 
+#nullable enable
+
 namespace Bit.Core.Entities;
 
 public class Event : ITableObject<Guid>, IEvent
@@ -49,10 +51,10 @@ public class Event : ITableObject<Guid>, IEvent
     public Guid? ProviderOrganizationId { get; set; }
     public DeviceType? DeviceType { get; set; }
     [MaxLength(50)]
-    public string IpAddress { get; set; }
+    public string? IpAddress { get; set; }
     public Guid? ActingUserId { get; set; }
     public EventSystemUser? SystemUser { get; set; }
-    public string DomainName { get; set; }
+    public string? DomainName { get; set; }
     public Guid? SecretId { get; set; }
     public Guid? ServiceAccountId { get; set; }
 
diff --git a/src/Core/Entities/Folder.cs b/src/Core/Entities/Folder.cs
index 37a1d3c692..378044725b 100644
--- a/src/Core/Entities/Folder.cs
+++ b/src/Core/Entities/Folder.cs
@@ -1,13 +1,15 @@
 using Bit.Core.Entities;
 using Bit.Core.Utilities;
 
+#nullable enable
+
 namespace Bit.Core.Vault.Entities;
 
 public class Folder : ITableObject<Guid>
 {
     public Guid Id { get; set; }
     public Guid UserId { get; set; }
-    public string Name { get; set; }
+    public string? Name { get; set; }
     public DateTime CreationDate { get; internal set; } = DateTime.UtcNow;
     public DateTime RevisionDate { get; internal set; } = DateTime.UtcNow;
 
diff --git a/src/Core/Entities/IRevisable.cs b/src/Core/Entities/IRevisable.cs
index bba3b3c94f..b9fb4b1144 100644
--- a/src/Core/Entities/IRevisable.cs
+++ b/src/Core/Entities/IRevisable.cs
@@ -1,5 +1,7 @@
 namespace Bit.Core.Entities;
 
+#nullable enable
+
 public interface IRevisable
 {
     DateTime CreationDate { get; }
diff --git a/src/Core/Entities/IStorable.cs b/src/Core/Entities/IStorable.cs
index fd0da49fea..06fa920883 100644
--- a/src/Core/Entities/IStorable.cs
+++ b/src/Core/Entities/IStorable.cs
@@ -1,5 +1,7 @@
 namespace Bit.Core.Entities;
 
+#nullable enable
+
 public interface IStorable
 {
     long? Storage { get; set; }
diff --git a/src/Core/Entities/IStorableSubscriber.cs b/src/Core/Entities/IStorableSubscriber.cs
index 27fcb25f6c..b3e24cc058 100644
--- a/src/Core/Entities/IStorableSubscriber.cs
+++ b/src/Core/Entities/IStorableSubscriber.cs
@@ -1,4 +1,6 @@
 namespace Bit.Core.Entities;
 
+#nullable enable
+
 public interface IStorableSubscriber : IStorable, ISubscriber
 { }
diff --git a/src/Core/Entities/ITableObject.cs b/src/Core/Entities/ITableObject.cs
index 1f54b8cc17..e4e50d928c 100644
--- a/src/Core/Entities/ITableObject.cs
+++ b/src/Core/Entities/ITableObject.cs
@@ -1,5 +1,7 @@
 namespace Bit.Core.Entities;
 
+#nullable enable
+
 public interface ITableObject<T> where T : IEquatable<T>
 {
     T Id { get; set; }
diff --git a/src/Core/Entities/Installation.cs b/src/Core/Entities/Installation.cs
index a91ecef2e7..ff30236d3d 100644
--- a/src/Core/Entities/Installation.cs
+++ b/src/Core/Entities/Installation.cs
@@ -1,15 +1,17 @@
 using System.ComponentModel.DataAnnotations;
 using Bit.Core.Utilities;
 
+#nullable enable
+
 namespace Bit.Core.Entities;
 
 public class Installation : ITableObject<Guid>
 {
     public Guid Id { get; set; }
     [MaxLength(256)]
-    public string Email { get; set; }
+    public string Email { get; set; } = null!;
     [MaxLength(150)]
-    public string Key { get; set; }
+    public string Key { get; set; } = null!;
     public bool Enabled { get; set; }
     public DateTime CreationDate { get; internal set; } = DateTime.UtcNow;
 
diff --git a/src/Core/Entities/OrganizationApiKey.cs b/src/Core/Entities/OrganizationApiKey.cs
index af9f3c9122..0fe56f123b 100644
--- a/src/Core/Entities/OrganizationApiKey.cs
+++ b/src/Core/Entities/OrganizationApiKey.cs
@@ -2,6 +2,8 @@
 using Bit.Core.Enums;
 using Bit.Core.Utilities;
 
+#nullable enable
+
 namespace Bit.Core.Entities;
 
 public class OrganizationApiKey : ITableObject<Guid>
@@ -10,7 +12,7 @@ public class OrganizationApiKey : ITableObject<Guid>
     public Guid OrganizationId { get; set; }
     public OrganizationApiKeyType Type { get; set; }
     [MaxLength(30)]
-    public string ApiKey { get; set; }
+    public string ApiKey { get; set; } = null!;
     public DateTime RevisionDate { get; set; }
 
     public void SetNewId()
diff --git a/src/Core/Entities/OrganizationConnection.cs b/src/Core/Entities/OrganizationConnection.cs
index 5b466fb4a6..ff4e6ef553 100644
--- a/src/Core/Entities/OrganizationConnection.cs
+++ b/src/Core/Entities/OrganizationConnection.cs
@@ -1,13 +1,17 @@
-using System.Text.Json;
+using System.Diagnostics.CodeAnalysis;
+using System.Text.Json;
 using Bit.Core.Enums;
 using Bit.Core.Models.OrganizationConnectionConfigs;
 using Bit.Core.Utilities;
 
+#nullable enable
+
 namespace Bit.Core.Entities;
 
 public class OrganizationConnection<T> : OrganizationConnection where T : IConnectionConfig
 {
-    public new T Config
+    [DisallowNull]
+    public new T? Config
     {
         get => base.GetConfig<T>();
         set => base.SetConfig(value);
@@ -20,17 +24,22 @@ public class OrganizationConnection : ITableObject<Guid>
     public OrganizationConnectionType Type { get; set; }
     public Guid OrganizationId { get; set; }
     public bool Enabled { get; set; }
-    public string Config { get; set; }
+    public string? Config { get; set; }
 
     public void SetNewId()
     {
         Id = CoreHelpers.GenerateComb();
     }
 
-    public T GetConfig<T>() where T : IConnectionConfig
+    public T? GetConfig<T>() where T : IConnectionConfig
     {
         try
         {
+            if (Config is null)
+            {
+                return default;
+            }
+
             return JsonSerializer.Deserialize<T>(Config);
         }
         catch (JsonException)
diff --git a/src/Core/Entities/OrganizationDomain.cs b/src/Core/Entities/OrganizationDomain.cs
index d275d075b2..adbf705105 100644
--- a/src/Core/Entities/OrganizationDomain.cs
+++ b/src/Core/Entities/OrganizationDomain.cs
@@ -1,15 +1,17 @@
 using System.ComponentModel.DataAnnotations;
 using Bit.Core.Utilities;
 
+#nullable enable
+
 namespace Bit.Core.Entities;
 
 public class OrganizationDomain : ITableObject<Guid>
 {
     public Guid Id { get; set; }
     public Guid OrganizationId { get; set; }
-    public string Txt { get; set; }
+    public string Txt { get; set; } = null!;
     [MaxLength(255)]
-    public string DomainName { get; set; }
+    public string DomainName { get; set; } = null!;
     public DateTime CreationDate { get; set; } = DateTime.UtcNow;
     public DateTime? VerifiedDate { get; private set; }
     public DateTime NextRunDate { get; private set; }
diff --git a/src/Core/Entities/OrganizationSponsorship.cs b/src/Core/Entities/OrganizationSponsorship.cs
index 8d747bd623..77c77eab21 100644
--- a/src/Core/Entities/OrganizationSponsorship.cs
+++ b/src/Core/Entities/OrganizationSponsorship.cs
@@ -2,6 +2,8 @@
 using Bit.Core.Enums;
 using Bit.Core.Utilities;
 
+#nullable enable
+
 namespace Bit.Core.Entities;
 
 public class OrganizationSponsorship : ITableObject<Guid>
@@ -11,9 +13,9 @@ public class OrganizationSponsorship : ITableObject<Guid>
     public Guid SponsoringOrganizationUserId { get; set; }
     public Guid? SponsoredOrganizationId { get; set; }
     [MaxLength(256)]
-    public string FriendlyName { get; set; }
+    public string? FriendlyName { get; set; }
     [MaxLength(256)]
-    public string OfferedToEmail { get; set; }
+    public string? OfferedToEmail { get; set; }
     public PlanSponsorshipType? PlanSponsorshipType { get; set; }
     public DateTime? LastSyncDate { get; set; }
     public DateTime? ValidUntil { get; set; }
diff --git a/src/Core/Entities/Role.cs b/src/Core/Entities/Role.cs
index 5e1f6319c2..b171652383 100644
--- a/src/Core/Entities/Role.cs
+++ b/src/Core/Entities/Role.cs
@@ -1,9 +1,11 @@
 namespace Bit.Core.Entities;
 
+#nullable enable
+
 /// <summary>
 /// This class is not used. It is implemented to make the Identity provider happy.
 /// </summary>
 public class Role
 {
-    public string Name { get; set; }
+    public string Name { get; set; } = null!;
 }
diff --git a/src/Core/Entities/TaxRate.cs b/src/Core/Entities/TaxRate.cs
index a04ccf445c..bf6406694d 100644
--- a/src/Core/Entities/TaxRate.cs
+++ b/src/Core/Entities/TaxRate.cs
@@ -1,17 +1,19 @@
 using System.ComponentModel.DataAnnotations;
 
+#nullable enable
+
 namespace Bit.Core.Entities;
 
 public class TaxRate : ITableObject<string>
 {
     [MaxLength(40)]
-    public string Id { get; set; }
+    public string Id { get; set; } = null!;
     [MaxLength(50)]
-    public string Country { get; set; }
+    public string Country { get; set; } = null!;
     [MaxLength(2)]
-    public string State { get; set; }
+    public string? State { get; set; }
     [MaxLength(10)]
-    public string PostalCode { get; set; }
+    public string PostalCode { get; set; } = null!;
     public decimal Rate { get; set; }
     public bool Active { get; set; }
 
diff --git a/src/Core/Entities/Transaction.cs b/src/Core/Entities/Transaction.cs
index 73f42bf97d..db51a31614 100644
--- a/src/Core/Entities/Transaction.cs
+++ b/src/Core/Entities/Transaction.cs
@@ -2,6 +2,8 @@
 using Bit.Core.Enums;
 using Bit.Core.Utilities;
 
+#nullable enable
+
 namespace Bit.Core.Entities;
 
 public class Transaction : ITableObject<Guid>
@@ -14,11 +16,11 @@ public class Transaction : ITableObject<Guid>
     public bool? Refunded { get; set; }
     public decimal? RefundedAmount { get; set; }
     [MaxLength(100)]
-    public string Details { get; set; }
+    public string? Details { get; set; }
     public PaymentMethodType? PaymentMethodType { get; set; }
     public GatewayType? Gateway { get; set; }
     [MaxLength(50)]
-    public string GatewayId { get; set; }
+    public string? GatewayId { get; set; }
     public DateTime CreationDate { get; set; } = DateTime.UtcNow;
     public Guid? ProviderId { get; set; }
 
diff --git a/src/Core/Entities/User.cs b/src/Core/Entities/User.cs
index bf13ff2a7d..0e538b9014 100644
--- a/src/Core/Entities/User.cs
+++ b/src/Core/Entities/User.cs
@@ -7,37 +7,39 @@ using Bit.Core.Tools.Entities;
 using Bit.Core.Utilities;
 using Microsoft.AspNetCore.Identity;
 
+#nullable enable
+
 namespace Bit.Core.Entities;
 
 public class User : ITableObject<Guid>, IStorableSubscriber, IRevisable, ITwoFactorProvidersUser, IReferenceable
 {
-    private Dictionary<TwoFactorProviderType, TwoFactorProvider> _twoFactorProviders;
+    private Dictionary<TwoFactorProviderType, TwoFactorProvider>? _twoFactorProviders;
 
     public Guid Id { get; set; }
     [MaxLength(50)]
-    public string Name { get; set; }
+    public string? Name { get; set; }
     [Required]
     [MaxLength(256)]
-    public string Email { get; set; }
+    public string Email { get; set; } = null!;
     public bool EmailVerified { get; set; }
     [MaxLength(300)]
-    public string MasterPassword { get; set; }
+    public string? MasterPassword { get; set; }
     [MaxLength(50)]
-    public string MasterPasswordHint { get; set; }
+    public string? MasterPasswordHint { get; set; }
     [MaxLength(10)]
     public string Culture { get; set; } = "en-US";
     [Required]
     [MaxLength(50)]
-    public string SecurityStamp { get; set; }
-    public string TwoFactorProviders { get; set; }
+    public string SecurityStamp { get; set; } = null!;
+    public string? TwoFactorProviders { get; set; }
     [MaxLength(32)]
-    public string TwoFactorRecoveryCode { get; set; }
-    public string EquivalentDomains { get; set; }
-    public string ExcludedGlobalEquivalentDomains { get; set; }
+    public string? TwoFactorRecoveryCode { get; set; }
+    public string? EquivalentDomains { get; set; }
+    public string? ExcludedGlobalEquivalentDomains { get; set; }
     public DateTime AccountRevisionDate { get; set; } = DateTime.UtcNow;
-    public string Key { get; set; }
-    public string PublicKey { get; set; }
-    public string PrivateKey { get; set; }
+    public string? Key { get; set; }
+    public string? PublicKey { get; set; }
+    public string? PrivateKey { get; set; }
     public bool Premium { get; set; }
     public DateTime? PremiumExpirationDate { get; set; }
     public DateTime? RenewalReminderDate { get; set; }
@@ -45,15 +47,15 @@ public class User : ITableObject<Guid>, IStorableSubscriber, IRevisable, ITwoFac
     public short? MaxStorageGb { get; set; }
     public GatewayType? Gateway { get; set; }
     [MaxLength(50)]
-    public string GatewayCustomerId { get; set; }
+    public string? GatewayCustomerId { get; set; }
     [MaxLength(50)]
-    public string GatewaySubscriptionId { get; set; }
-    public string ReferenceData { get; set; }
+    public string? GatewaySubscriptionId { get; set; }
+    public string? ReferenceData { get; set; }
     [MaxLength(100)]
-    public string LicenseKey { get; set; }
+    public string? LicenseKey { get; set; }
     [Required]
     [MaxLength(30)]
-    public string ApiKey { get; set; }
+    public string ApiKey { get; set; } = null!;
     public KdfType Kdf { get; set; } = KdfType.PBKDF2_SHA256;
     public int KdfIterations { get; set; } = AuthConstants.PBKDF2_ITERATIONS.Default;
     public int? KdfMemory { get; set; }
@@ -65,7 +67,7 @@ public class User : ITableObject<Guid>, IStorableSubscriber, IRevisable, ITwoFac
     public int FailedLoginCount { get; set; }
     public DateTime? LastFailedLoginDate { get; set; }
     [MaxLength(7)]
-    public string AvatarColor { get; set; }
+    public string? AvatarColor { get; set; }
     public DateTime? LastPasswordChangeDate { get; set; }
     public DateTime? LastKdfChangeDate { get; set; }
     public DateTime? LastKeyRotationDate { get; set; }
@@ -76,12 +78,12 @@ public class User : ITableObject<Guid>, IStorableSubscriber, IRevisable, ITwoFac
         Id = CoreHelpers.GenerateComb();
     }
 
-    public string BillingEmailAddress()
+    public string? BillingEmailAddress()
     {
         return Email?.ToLowerInvariant()?.Trim();
     }
 
-    public string BillingName()
+    public string? BillingName()
     {
         return Name;
     }
@@ -125,7 +127,7 @@ public class User : ITableObject<Guid>, IStorableSubscriber, IRevisable, ITwoFac
 
     public bool IsExpired() => PremiumExpirationDate.HasValue && PremiumExpirationDate.Value <= DateTime.UtcNow;
 
-    public Dictionary<TwoFactorProviderType, TwoFactorProvider> GetTwoFactorProviders()
+    public Dictionary<TwoFactorProviderType, TwoFactorProvider>? GetTwoFactorProviders()
     {
         if (string.IsNullOrWhiteSpace(TwoFactorProviders))
         {
@@ -178,7 +180,7 @@ public class User : ITableObject<Guid>, IStorableSubscriber, IRevisable, ITwoFac
         SetTwoFactorProviders(new Dictionary<TwoFactorProviderType, TwoFactorProvider>());
     }
 
-    public TwoFactorProvider GetTwoFactorProvider(TwoFactorProviderType provider)
+    public TwoFactorProvider? GetTwoFactorProvider(TwoFactorProviderType provider)
     {
         var providers = GetTwoFactorProviders();
         if (providers == null || !providers.ContainsKey(provider))