Hi anaih208,
Thanks for contacting Apple Support Communities!
We understand you've linked Apple Music to Google Home and you're still unable to play Apple Music.
If you're unable to play Apple Music via your Google Nest or display, you can unlink your Apple Music, restart your devices then link them again to refresh their settings as outlined here: Play Apple Music on your Google Nest speaker or display
"Unlink Apple Music from your Nest device
- On your iPhone, iPad, or Android device, open the Google Home app.
- Tap Settings.
- Tap Music.
- Under Apple Music, tap Unlink. If Apple Music is set as your default music service, select another music service as your default, or select "No default." Then tap Unlink under Apple Music."
We hope this helps you.
Cheers!