diff --git a/src/OrchardCore.Modules/OrchardCore.Users/Workflows/Startup.cs b/src/OrchardCore.Modules/OrchardCore.Users/Workflows/Startup.cs
index 67aa8079a34..2804d0d9570 100644
--- a/src/OrchardCore.Modules/OrchardCore.Users/Workflows/Startup.cs
+++ b/src/OrchardCore.Modules/OrchardCore.Users/Workflows/Startup.cs
@@ -22,6 +22,8 @@ public override void ConfigureServices(IServiceCollection services)
             services.AddActivity<UserLoggedInEvent, UserLoggedInEventDisplayDriver>();
             services.AddScoped<IUserEventHandler, UserEventHandler>();
             services.AddActivity<AssignUserRoleTask, AssignUserRoleTaskDisplayDriver>();
+            services.AddActivity<RemoveUserRoleTask, RemoveUserRoleTaskDisplayDriver>();
+            services.AddActivity<SelectUsersInRoleTask, SelectUsersInRoleTaskDisplayDriver>();
             services.AddActivity<ValidateUserTask, ValidateUserTaskDisplayDriver>();
         }
     }