HomePod Mini Won’t Play Music Library

Reposting since Apple took my question down (I guess I'm not allowed to say that having products called Music and Apple Music makes explaining this issue complicated?)

When I ask Siri on my new HomePod Mini to play something in my Music Library (thousands of songs I've owned for years), it says it can’t find the “song/artist in your music library.” But it’s there. I can play these songs from my iPhone or MacBook. From the iPhone or MacBook I can also manually change the audio output to go to the HomePod. But if I use Siri commands, the HomePod ONLY plays from…idk what to call it…it only plays from a small number of songs that were purchased and downloaded through iTunes years ago (like that infamous U2 album).

I do not subscribe to Apple Music (nor am I interested).

I just want to be able to ask it to play songs that I own that are in my Music Library.

This person has my problem also. I followed the instructions in the "solution" but, like them, those instructions didn't solve my problem: https://discussions.apple.com/thread/252157082?answerId=254133210022#254133210022

If it can't simply play music I own, I dunno. It already can’t play Spotify by voice command. If it won’t even play my own music from my own Music Library without manual intervention, what’s the point?

I just need a speaker in my home office and wanted the higher quality sound from a HomePod. But, be honest with me, if I'm mainly going to listen to my personal Music Library or Spotify and have no intention of signing up for an Apple Music subscription, should I get a different speaker?