Certain apps on the Mac App Store are not updating (apart from iTunes and system updates), these include Pages, Numbers, Shazam, Evernote, OneDrive, etc.
It gives the following errors each time and refuses to update.
This item is temporarily unavailable. Please try again later.
We could not complete your request. There was an error in the App Store. Please try again later.
I have macOS 10.12.2 on MacBook Pro mid 2015.