Can’t believe it’s still not fixed. I want to be able to log in using email + password combination!
It’s unbelievable this hasn’t been fixed. 
I am also having this problem Have someone found the solution?
Come on open ai, most of the today’s softwares are already having a feature which offers merging 2 auth providers. This is disappointing, do you really want us to login with Google on other non-personel machines?