ASP.NET Core Identity - Allow optional (yet unique) email address How to allow user registration without requiring an e-mail address (while preserving the dupe-check in case it's present) in ASP.NET Core Identity
One of the main reasons I like ASP.NET Core Identity is that it provides all the tools you need to handle user registration: customizable password strength, e-mail verification system, configurable lockout …
ASP.NET Core Identity - Allow optional (yet unique) email address How to allow user registration without requiring an e-mail address (while preserving the dupe-check in case it's present) in ASP.NET Core Identity Read More