AppleMusic App can no longer play my purchased music

All of a sudden, I can no longer play any music I purchased or uploaded into my Mac. I can only play music I downloaded from AppleMusic. When I click on PLAY icon, nothing happens, no error, nothing.

I am an AppleOne subscriber.

Why is this happening?

It was working fine previously (perhaps a couple of months ago). I usually listen to music on AppleTV but I do listen to music every now & then from my MacStudio.

Yes, I checked my limits: AppleMusic App says I used 4 out of 5 devices. So, I have not run over my limits.