Windows 10 login only accepting e-mail not local domain user
Solution 1:
Today I wanted to create a local account to personalise another desktop for a specific type of work.
Upon creation Trying to switch that user will show a wrong username / password. Attempting to type "\username" results in the error "You can't sign in with a user ID in this format. Try using your email address instead.
You need to log into the local account by switching the to the local machine instead of trying to log into the domain.
You can do this by using: ComputerName\Username