Sorry, there's a problem with Apple Music

Nothing works. I called apple and after 4 phone calls and 12 hours on the phone they finally admitted that they need an update to fix it.

If I had a more focused solution I'd have posted it. And of course often the reboot or restart does help because reasons. Failing that one might try signing out of the Apple ID for Music on the device and then sign in again, which is somewhat more complicated thing to do, or reset the device and set up from scratch. The method of last resort when troubleshooting HomePod issues is to tear down the Home and then set up every HomeKit device and accessory once again. None of this helps with why some users get this message from time-to-time, or if there is some easier fix. I don't know why this happens, and if there is a better fix I haven't yet heard about it.

tt2

You might find that rebooting your router and/or your HomePod will resolve this.

tt2

Not helpful. Old tech guy standard answer is REBOOT or RESTART. Must be a better answer.