Missing Apple ID
I have an old iPhone 5 that I'm trying to reset; it's been years since I've done anything with it.
When I try to erase it, to put it back to factory settings, it requests an password for an Apple ID that's an old work email address; I've since forgotten the Apple password I used.
Here's the problem: *Apple* doesn't recognize this email address--though it's being requested by my phone--as an Apple ID, and so I can't even reset the password. I get
"This Apple ID is not valid or not supported."
Any thoughts about how to resolve this? Not that it's a great loss, but it's an annoyance.