I have created an application and I am completely finished. I have a login and sign up where users can create their accounts then go ahead and login. However now I must focus on security. I need to authenticate my users but with my existing table called ClubUser. The problem is I don't wanna use google or Microsoft or twitter. I have been looking into azure active directory but I am confused and I don't understand. It seems there is no way for the azure ad to sign users up, and no way to assign them custom attributes. Also, it says all users must have a Microsoft account and that does not work for my app. I have read the azure docs <https://learn.microsoft.com/en-us/azure/sql-database/sql-database-aad-authentication>