Support needed for iTunes Match with Apple Music App on Windows 11 PC

I just subscribed to iTunes Match after a couple decades of just syncing (selected) music to my iPhones via USB cable. I have a 300G-music library, so copying everything onto the phones was not feasible.

I decided to make the change because I want to get a HomePod and be able to stream music from an iCloud Library of music I already own.

My set-up includes

• iPhone 14
• iPad mini (6)
• Windows 11 laptop with Apple Music App (recently transitioned from iTunes)

I know that it would take a long time to scan, match, and upload the whole thing. It seems to be working but I have the following issues:

• Cloud status in the PC Apple Music App for some of the songs say “Error”
• Songs that have been matched per the PC app show up greyed out on my Apple devices. The message when I clicked on them was either that the song has not been synced and I need to set it to sync on my PC app, or it claims that the song is not available in my country/region.
• The existing playlists on my iTunes for Windows were not showing up in the Apple Music app.

My questions are:

• What could have caused the “Error” and how do I execute a re-scan to see if the “Error” could be resolved?
• Will a re-scan allow the Apple Music app to find the old playlists from the iTunes library index?
• If the PC app is already set to sync, how come the songs are greyed out on the devices?
• Since all my music was either imported from CDs I own or MP3s that o have bought, why would they not be available?

I don’t have and don’t plan on getting an Apple Music subscription, as my understanding of iTunes Match leads me to believe that it alone would do what I’d like the HomePod to do.

Any help or suggestions you could give me would be greatly appreciated.

Thanks.