How do I unlink my iMessage from an old email address?
I switched to an iCloud account years ago, but iMessage keeps asking for an old gmail password. The gmail account isn’t recognized by Apple anymore. How do I get this “undone?” I’m already signed out of iMessage - and it won’t let me sign in until I enter the gmail password, which I don’t have and can’t get.
MacBook Air 13", macOS 10.14