Often your Apple Privacy email is used when creating accounts. If you find your email address is not working when logging in, then try your Apple Privacy email. Here are the steps to locate this email.
On your phone:
- Go to Settings, and tap your name (Apple ID) at the top to access your account.
- Tap iCloud > Hide My Email. ...
- Tap any of the items in the list to see the label, the random address Hide My Email created, and where it's getting forwarded to.