I noticed that if you sign up with an email and password, then later log in via Google, Apple, or Microsoft (OAuth2), you can use either authentication method. However, the reverse isn’t possible—there’s no option to enable password login after using OAuth2.
Reference: Article.
Many other platforms, such as Twitter and Atlassian, allow users who sign up via OAuth2. Later, we can reset the password by clicking “Forgot Password”, making it easier to log in from different devices without needing to authenticate through Google, Apple, or Microsoft each time.
I believe adding this option would improve flexibility and security. I would appreciate it if OpenAI could consider implementing password authentication alongside OAuth2.