Siri on HomePod: "Sorry, there was a problem with Apple Music"
Started having this problem a few days ago - Paired HomePods set to be Apple TV speakers - but verbal commands to play music resulted in the above quotation. - tried all sorts of things, but finally, did an Apple TV factory reset/update to latest software (Even though it was already up to date) , new Setup with iPhone - and now all works as before. Thankfully all my shows, apps were in the cloud and automatically reinstalled.