For some reason, Match is no longer showing up in iTunes. My AppleID is different from my iTunes ID, if that makes a difference. This used to work fine - in fact the Match process successfully completed for over 22,000 tracks. I have no idea "where it went".
Ideas or suggestions most welcome.
It sounds like your iTunes Store account ID has been logged out.
1. Open iTunes.
2. Pull down Store > Sign In to log back in.
3. After that pull down Store > Turn On iTunes Match.
BTW, Apple calls all IDs for their various services "Apple IDs" so unless you tell us what service that particular iD is associated with the term isn't very helpful.