App Store update not working in Mac after upgrading to Sierra I have recently upgraded my Mac to Sierra. After upgrading AppStore update not working. It shows I have to update for apps Keynote, Pages, Numbers and GarageBand. But while I want to update those individually or all at once every time AppStore ask for the password. If I put correct password it ask the password again and again. If I put incorrect password it shows that password is incorrect.
Here's some things to try:


Close and reopen App Store
Reenter iCloud credentials in System Preferences
Turn Mac off and back on


If none of those work, it might be an issue with Apple's servers, in which case you'll have to wait it out.