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Can't login to App Store under Catalina
Helloit finally worked for me to leave the account of mac itunes, appstore and finally in system preferences.Then I restarted on mac and opened again in system preferences. I entered my Apple ID this time with @ icloud.com because I was using @ mac.com, I do not know if it will be important. Then I opened apps store and I entered the ID of apple and password and I have already been able to download my applications.I have not yet entered my ID into iTunes until you download all my appstore apps