Siri no longer plays requested music

Going through the Reset Homepod process fixes this issue. I have done it on two (one Original and one Mini) and Siri is back to responding to music requests.

With your iPhone, use the Home App to Remove the Homepod from the Home, and then power-cycle the Homepod. Let the Homepod Setup process do the rest. Keep your iPhone near the Homepod during this process...you will need it. But...pretty painless really.

And I tried it again on a second homepod in the house. It acts like it is attempting a sign-in, and then eventually times out, with a message that says "Could not complete operation. "timed out cmuunicating with the accessory. Make sure you're connected to the internet and try again." Of course, I am connected to the internet as I type this.

Now, after I choose OK on the error message, signing in to the same homepod to repeat this procedure is no longer possible. I can tap the Sign In button, but nothing happens.

Started that process per your recommendation. It failed for some reason. Now it won't let me assign a primary user.

Glad to hear it's not just me. I think there is a clear bug here where the v16.0 device OSes (Homepod & AppleTV) are not playing well with devices using iOS and iPadOS 15.7.