We've been experiencing errors when deleting users since moving to ASP.NET Identity. We are able to delete the user using the UserManager just fine, but cannot delete the contacts. We get the following exception since implementing ASP.NET Identity in the same fashion as described here.

[ProviderException: Default Membership Provider must be specified.]
   System.Web.Security.Membership.InitializeDefaultProvider(Boolean initializeDefaultProvider, MembershipSection settings) +10174203
   System.Web.Security.Membership.Initialize() +455
   System.Web.Security.Membership.get_Provider() +9
   System.Web.Security.Membership.GetUser(String username, Boolean userIsOnline) +41
   Mediachase.Commerce.Customers.CustomerContext.GetUserForContactId(PrimaryKeyId customerContactId) +164
   Mediachase.Commerce.Customers.Handlers.ContactRequestHandler.PreDelete(BusinessContext context) +211
   Mediachase.BusinessFoundation.Data.Business.EntityObjectDefaultRequestHandler.PreExecute(BusinessContext context) +612
   Mediachase.BusinessFoundation.Data.Business.BaseRequestHandler.Mediachase.BusinessFoundation.Data.Business.IRequestHandler.PreExecute(BusinessContext context) +51
   Mediachase.BusinessFoundation.Data.Business.BusinessManager.Execute(Request request) +496
   Mediachase.BusinessFoundation.Data.Business.BusinessManager.Delete(EntityObject entityObject) +72
   EPiServer.Reference.Commerce.Site.Features.Login.Controllers.LoginController.DeleteUsers() in C:\dev\Quicksilver\Sources\EPiServer.Reference.Commerce.Site\Features\Login\Controllers\LoginController.cs:75

The code in question was added to Quicksilver LoginController Index to confirm that it wasn't a configuration issue in my project. The Guid for the contact of a new user I created from the admin area on Quicksilver. Nothing else has been modified from Quicksilver 10.8.

        private void DeleteUsers()
        {
            var myGuid = new Guid("128ED95A-6D32-4745-9930-F3BA8A7CC502");
            var contact = CustomerContext.Current.GetContactById(myGuid);
            if (contact != null)
            {
                BusinessManager.Delete(contact);
            }
        }

Is there a fix for this or anything I should be doing differently? I noticed another post with this error, but during authentication and not deletion. There is no follow up post either with a resolution.