iMessage
It says…. This email is not available. Choose a different address, how do I change that?
iPhone SE (3rd generation)
User profile for user:
alma1090
User level:
Community Specialist
Hey there none129,
We understand you're trying to sign into iMessage, but are being told that the email is not available. We'd be happy to provide information about to do next.
Sounds like you're pressing the button for creating an Apple ID. What you want to do is sign in by entering your Apple ID and password. If you've forgotten this information, use the steps here to recover it:
If you forgot your Apple ID email address or phone number - Apple Support
If you forgot your Apple ID password - Apple Support
Kind regards.