Logging into iCloud--popup shows old email address
I have encountered exactly the same problem described by a prior user in the Community: "Hi! I recently signed into icloud to manage my storage and a new
continuous popup keeps asking me to sign in under my old email address
(I'm already signed in under new email). This is only happening on my
home computer. It won't let me change the email address to the new one.
It keeps popping up over and over and is so annoying. If anyone can help
how I can stop this I would greatly appreciate it! Its popped up twice
while I type this. Thank you!"
The solution you provided did not work. Come on--this should be basic.