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I just fixed the issue on my Mac after none of these solutions worked for me since June. When being prompted to login to the App Store, enter a different email address. Then, re-enter your actual iCloud email address - you'll see the password prompt go away while you're doing this and then come up again once you confirm your email address. I think when it has your email credentials saved, the "saved" address isn't going through as expected for some people so re-entering sort of purges the "corrupted" text. Good luck.