I have an asp.net webforms (c#) app using mixed authentication. Depending on the type of email suffix entered the users are authenticated via the forms method or if the login email belongs to the organization, use the 365 authentication using oauth2.

I’ve already done the heavy lifting but I’d like oauth script to pass the previously entered email address into the 365 login so it simply asks for the password rather than having to enter the login name a second time.

I’ve been unable to identify any as-yet useful code.