diff --git a/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IdentityUser.cs b/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IdentityUser.cs
index aca1535c3c..c6ad077456 100644
--- a/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IdentityUser.cs
+++ b/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IdentityUser.cs
@@ -130,16 +130,17 @@ namespace Volo.Abp.Identity
             ExtraProperties = new Dictionary<string, object>();
         }
 
-        public IdentityUser(Guid id, [NotNull] string userName, string email = null, Guid? tenantId = null)
+        public IdentityUser(Guid id, [NotNull] string userName, [NotNull] string email, Guid? tenantId = null)
         {
             Check.NotNull(userName, nameof(userName));
+            Check.NotNull(email, nameof(email));
 
             Id = id;
             TenantId = tenantId;
             UserName = userName;
             NormalizedUserName = userName.ToUpperInvariant();
             Email = email;
-            NormalizedEmail = email?.ToUpperInvariant();
+            NormalizedEmail = email.ToUpperInvariant();
             ConcurrencyStamp = Guid.NewGuid().ToString();
             SecurityStamp = Guid.NewGuid().ToString();
 
diff --git a/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IdentityUserStore.cs b/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IdentityUserStore.cs
index bac63a0c11..e92f31797d 100644
--- a/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IdentityUserStore.cs
+++ b/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IdentityUserStore.cs
@@ -597,11 +597,12 @@ namespace Volo.Abp.Identity
         /// <param name="email">The email to set.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> used to propagate notifications that the operation should be canceled.</param>
         /// <returns>The task object representing the asynchronous operation.</returns>
-        public virtual Task SetEmailAsync([NotNull] IdentityUser user, string email, CancellationToken cancellationToken = default)
+        public virtual Task SetEmailAsync([NotNull] IdentityUser user, [NotNull]  string email, CancellationToken cancellationToken = default)
         {
             cancellationToken.ThrowIfCancellationRequested();
 
             Check.NotNull(user, nameof(user));
+            Check.NotNull(email, nameof(email));
 
             user.Email = email;
 
diff --git a/modules/identity/src/Volo.Abp.Identity.EntityFrameworkCore/Volo/Abp/Identity/EntityFrameworkCore/IdentityDbContextModelBuilderExtensions.cs b/modules/identity/src/Volo.Abp.Identity.EntityFrameworkCore/Volo/Abp/Identity/EntityFrameworkCore/IdentityDbContextModelBuilderExtensions.cs
index a2a63062d3..76ac038c05 100644
--- a/modules/identity/src/Volo.Abp.Identity.EntityFrameworkCore/Volo/Abp/Identity/EntityFrameworkCore/IdentityDbContextModelBuilderExtensions.cs
+++ b/modules/identity/src/Volo.Abp.Identity.EntityFrameworkCore/Volo/Abp/Identity/EntityFrameworkCore/IdentityDbContextModelBuilderExtensions.cs
@@ -29,7 +29,7 @@ namespace Volo.Abp.Identity.EntityFrameworkCore
                 b.ConfigureAbpUser();
 
                 b.Property(u => u.NormalizedUserName).IsRequired().HasMaxLength(IdentityUserConsts.MaxNormalizedUserNameLength).HasColumnName(nameof(IdentityUser.NormalizedUserName));
-                b.Property(u => u.NormalizedEmail).HasMaxLength(IdentityUserConsts.MaxNormalizedEmailLength).HasColumnName(nameof(IdentityUser.NormalizedEmail));
+                b.Property(u => u.NormalizedEmail).IsRequired().HasMaxLength(IdentityUserConsts.MaxNormalizedEmailLength).HasColumnName(nameof(IdentityUser.NormalizedEmail));
                 b.Property(u => u.PasswordHash).HasMaxLength(IdentityUserConsts.MaxPasswordHashLength).HasColumnName(nameof(IdentityUser.PasswordHash));
                 b.Property(u => u.SecurityStamp).IsRequired().HasMaxLength(IdentityUserConsts.MaxSecurityStampLength).HasColumnName(nameof(IdentityUser.SecurityStamp));
                 b.Property(u => u.TwoFactorEnabled).HasDefaultValue(false).HasColumnName(nameof(IdentityUser.TwoFactorEnabled));
diff --git a/modules/users/src/Volo.Abp.Users.EntityFrameworkCore/Volo/Abp/Users/EntityFrameworkCore/AbpUsersDbContextModelCreatingExtensions.cs b/modules/users/src/Volo.Abp.Users.EntityFrameworkCore/Volo/Abp/Users/EntityFrameworkCore/AbpUsersDbContextModelCreatingExtensions.cs
index 1b95984e4b..e8c95b5659 100644
--- a/modules/users/src/Volo.Abp.Users.EntityFrameworkCore/Volo/Abp/Users/EntityFrameworkCore/AbpUsersDbContextModelCreatingExtensions.cs
+++ b/modules/users/src/Volo.Abp.Users.EntityFrameworkCore/Volo/Abp/Users/EntityFrameworkCore/AbpUsersDbContextModelCreatingExtensions.cs
@@ -10,7 +10,7 @@ namespace Volo.Abp.Users.EntityFrameworkCore
         {
             b.Property(u => u.TenantId).HasColumnName(nameof(IUser.TenantId));
             b.Property(u => u.UserName).IsRequired().HasMaxLength(AbpUserConsts.MaxUserNameLength).HasColumnName(nameof(IUser.UserName));
-            b.Property(u => u.Email).HasMaxLength(AbpUserConsts.MaxEmailLength).HasColumnName(nameof(IUser.Email));
+            b.Property(u => u.Email).IsRequired().HasMaxLength(AbpUserConsts.MaxEmailLength).HasColumnName(nameof(IUser.Email));
             b.Property(u => u.Name).HasMaxLength(AbpUserConsts.MaxNameLength).HasColumnName(nameof(IUser.Name));
             b.Property(u => u.Surname).HasMaxLength(AbpUserConsts.MaxSurnameLength).HasColumnName(nameof(IUser.Surname));
             b.Property(u => u.EmailConfirmed).HasDefaultValue(false).HasColumnName(nameof(IUser.EmailConfirmed));