diff --git a/src/Core/Constants.cs b/src/Core/Constants.cs
index defcc41e93..f06f63573d 100644
--- a/src/Core/Constants.cs
+++ b/src/Core/Constants.cs
@@ -115,7 +115,6 @@ public static class FeatureFlagKeys
     public const string PM4154BulkEncryptionService = "PM-4154-bulk-encryption-service";
     public const string VaultBulkManagementAction = "vault-bulk-management-action";
     public const string MemberAccessReport = "ac-2059-member-access-report";
-    public const string BlockLegacyUsers = "block-legacy-users";
     public const string InlineMenuFieldQualification = "inline-menu-field-qualification";
     public const string TwoFactorComponentRefactor = "two-factor-component-refactor";
     public const string InlineMenuPositioningImprovements = "inline-menu-positioning-improvements";
diff --git a/src/Identity/IdentityServer/RequestValidators/BaseRequestValidator.cs b/src/Identity/IdentityServer/RequestValidators/BaseRequestValidator.cs
index 78c00f86d5..ea207a7aaa 100644
--- a/src/Identity/IdentityServer/RequestValidators/BaseRequestValidator.cs
+++ b/src/Identity/IdentityServer/RequestValidators/BaseRequestValidator.cs
@@ -183,13 +183,10 @@ public abstract class BaseRequestValidator<T> where T : class
         }
 
         // 5. Force legacy users to the web for migration
-        if (FeatureService.IsEnabled(FeatureFlagKeys.BlockLegacyUsers))
+        if (UserService.IsLegacyUser(user) && request.ClientId != "web")
         {
-            if (UserService.IsLegacyUser(user) && request.ClientId != "web")
-            {
-                await FailAuthForLegacyUserAsync(user, context);
-                return;
-            }
+            await FailAuthForLegacyUserAsync(user, context);
+            return;
         }
 
         await BuildSuccessResultAsync(user, context, validatorContext.Device, returnRememberMeToken);
diff --git a/test/Identity.Test/IdentityServer/BaseRequestValidatorTests.cs b/test/Identity.Test/IdentityServer/BaseRequestValidatorTests.cs
index 02b6982419..916b52e1d0 100644
--- a/test/Identity.Test/IdentityServer/BaseRequestValidatorTests.cs
+++ b/test/Identity.Test/IdentityServer/BaseRequestValidatorTests.cs
@@ -369,7 +369,6 @@ public class BaseRequestValidatorTests
         context.CustomValidatorRequestContext.CaptchaResponse.IsBot = false;
         context.ValidatedTokenRequest.ClientId = "Not Web";
         _sut.isValid = true;
-        _featureService.IsEnabled(FeatureFlagKeys.BlockLegacyUsers).Returns(true);
         _twoFactorAuthenticationValidator
             .RequiresTwoFactorAsync(Arg.Any<User>(), Arg.Any<ValidatedTokenRequest>())
             .Returns(Task.FromResult(new Tuple<bool, Organization>(false, null)));