diff --git a/src/Umbraco.Web.Common/DependencyInjection/UmbracoBuilder.MembersIdentity.cs b/src/Umbraco.Web.Common/DependencyInjection/UmbracoBuilder.MembersIdentity.cs
index 98391d7590..7ad9618ba5 100644
--- a/src/Umbraco.Web.Common/DependencyInjection/UmbracoBuilder.MembersIdentity.cs
+++ b/src/Umbraco.Web.Common/DependencyInjection/UmbracoBuilder.MembersIdentity.cs
@@ -58,7 +58,6 @@ namespace Umbraco.Extensions
                 .AddRoleManager<IMemberRoleManager, MemberRoleManager>()
                 .AddMemberManager<IMemberManager, MemberManager>()
                 .AddSignInManager<IMemberSignInManager, MemberSignInManager>()
-                .AddSignInManager<IMemberSignInManagerExternalLogins, MemberSignInManager>()
                 .AddErrorDescriber<MembersErrorDescriber>()
                 .AddUserConfirmation<UmbracoUserConfirmation<MemberIdentityUser>>();
 
diff --git a/src/Umbraco.Web.Common/Security/IMemberSignInManager.cs b/src/Umbraco.Web.Common/Security/IMemberSignInManager.cs
index 04d591866d..6eb67eb60b 100644
--- a/src/Umbraco.Web.Common/Security/IMemberSignInManager.cs
+++ b/src/Umbraco.Web.Common/Security/IMemberSignInManager.cs
@@ -1,4 +1,5 @@
 using System.Threading.Tasks;
+using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Identity;
 using Umbraco.Cms.Core.Security;
 
@@ -11,5 +12,12 @@ namespace Umbraco.Cms.Web.Common.Security
         Task<SignInResult> PasswordSignInAsync(string userName, string password, bool isPersistent, bool lockoutOnFailure);
         Task SignInAsync(MemberIdentityUser user, bool isPersistent, string? authenticationMethod = null);
         Task SignOutAsync();
+
+        AuthenticationProperties ConfigureExternalAuthenticationProperties(string provider, string redirectUrl, string? userId = null);
+        Task<ExternalLoginInfo?> GetExternalLoginInfoAsync(string? expectedXsrf = null);
+        Task<IdentityResult> UpdateExternalAuthenticationTokensAsync(ExternalLoginInfo externalLogin);
+        Task<SignInResult> ExternalLoginSignInAsync(ExternalLoginInfo loginInfo, bool isPersistent, bool bypassTwoFactor = false);
+        Task<MemberIdentityUser> GetTwoFactorAuthenticationUserAsync();
+        Task<SignInResult> TwoFactorSignInAsync(string? provider, string? code, bool isPersistent, bool rememberClient);
     }
 }
diff --git a/src/Umbraco.Web.Common/Security/IMemberSignInManagerExternalLogins.cs b/src/Umbraco.Web.Common/Security/IMemberSignInManagerExternalLogins.cs
deleted file mode 100644
index 558fd8d86b..0000000000
--- a/src/Umbraco.Web.Common/Security/IMemberSignInManagerExternalLogins.cs
+++ /dev/null
@@ -1,19 +0,0 @@
-using System;
-using System.Threading.Tasks;
-using Microsoft.AspNetCore.Authentication;
-using Microsoft.AspNetCore.Identity;
-using Umbraco.Cms.Core.Security;
-
-namespace Umbraco.Cms.Web.Common.Security
-{
-    [Obsolete("This interface will be merged with IMemberSignInManager in Umbraco 10")]
-    public interface IMemberSignInManagerExternalLogins : IMemberSignInManager
-    {
-        AuthenticationProperties ConfigureExternalAuthenticationProperties(string provider, string redirectUrl, string? userId = null);
-        Task<ExternalLoginInfo?> GetExternalLoginInfoAsync(string? expectedXsrf = null);
-        Task<IdentityResult> UpdateExternalAuthenticationTokensAsync(ExternalLoginInfo externalLogin);
-        Task<SignInResult> ExternalLoginSignInAsync(ExternalLoginInfo loginInfo, bool isPersistent, bool bypassTwoFactor = false);
-        Task<MemberIdentityUser> GetTwoFactorAuthenticationUserAsync();
-        Task<SignInResult> TwoFactorSignInAsync(string? provider, string? code, bool isPersistent, bool rememberClient);
-    }
-}
diff --git a/src/Umbraco.Web.Common/Security/MemberSignInManager.cs b/src/Umbraco.Web.Common/Security/MemberSignInManager.cs
index 2710dc38c1..e0f5f19457 100644
--- a/src/Umbraco.Web.Common/Security/MemberSignInManager.cs
+++ b/src/Umbraco.Web.Common/Security/MemberSignInManager.cs
@@ -22,7 +22,7 @@ namespace Umbraco.Cms.Web.Common.Security
     /// <summary>
     /// The sign in manager for members
     /// </summary>
-    public class MemberSignInManager : UmbracoSignInManager<MemberIdentityUser>, IMemberSignInManagerExternalLogins
+    public class MemberSignInManager : UmbracoSignInManager<MemberIdentityUser>, IMemberSignInManager
     {
         private readonly IMemberExternalLoginProviders _memberExternalLoginProviders;
         private readonly IEventAggregator _eventAggregator;
diff --git a/src/Umbraco.Web.Website/Controllers/UmbExternalLoginController.cs b/src/Umbraco.Web.Website/Controllers/UmbExternalLoginController.cs
index 526e647b10..dc079cd605 100644
--- a/src/Umbraco.Web.Website/Controllers/UmbExternalLoginController.cs
+++ b/src/Umbraco.Web.Website/Controllers/UmbExternalLoginController.cs
@@ -33,7 +33,7 @@ namespace Umbraco.Cms.Web.Website.Controllers
         private readonly ITwoFactorLoginService _twoFactorLoginService;
         private readonly IOptions<SecuritySettings> _securitySettings;
         private readonly ILogger<UmbExternalLoginController> _logger;
-        private readonly IMemberSignInManagerExternalLogins _memberSignInManager;
+        private readonly IMemberSignInManager _memberSignInManager;
 
         public UmbExternalLoginController(
             ILogger<UmbExternalLoginController> logger,
@@ -43,7 +43,7 @@ namespace Umbraco.Cms.Web.Website.Controllers
             AppCaches appCaches,
             IProfilingLogger profilingLogger,
             IPublishedUrlProvider publishedUrlProvider,
-            IMemberSignInManagerExternalLogins memberSignInManager,
+            IMemberSignInManager memberSignInManager,
             IMemberManager memberManager,
             ITwoFactorLoginService twoFactorLoginService,
             IOptions<SecuritySettings> securitySettings)
diff --git a/src/Umbraco.Web.Website/Controllers/UmbTwoFactorLoginController.cs b/src/Umbraco.Web.Website/Controllers/UmbTwoFactorLoginController.cs
index c8c8536d62..e1762c40a2 100644
--- a/src/Umbraco.Web.Website/Controllers/UmbTwoFactorLoginController.cs
+++ b/src/Umbraco.Web.Website/Controllers/UmbTwoFactorLoginController.cs
@@ -29,7 +29,7 @@ namespace Umbraco.Cms.Web.Website.Controllers
         private readonly IMemberManager _memberManager;
         private readonly ITwoFactorLoginService _twoFactorLoginService;
         private readonly ILogger<UmbTwoFactorLoginController> _logger;
-        private readonly IMemberSignInManagerExternalLogins _memberSignInManager;
+        private readonly IMemberSignInManager _memberSignInManager;
 
         public UmbTwoFactorLoginController(
             ILogger<UmbTwoFactorLoginController> logger,
@@ -39,7 +39,7 @@ namespace Umbraco.Cms.Web.Website.Controllers
             AppCaches appCaches,
             IProfilingLogger profilingLogger,
             IPublishedUrlProvider publishedUrlProvider,
-            IMemberSignInManagerExternalLogins memberSignInManager,
+            IMemberSignInManager memberSignInManager,
             IMemberManager memberManager,
             ITwoFactorLoginService twoFactorLoginService)
             : base(