'The Cloud Music Library can't be updated right now?'

Greetings, elidefaria!

Thanks for reaching out to the Apple Support Communities! It sounds like you're seeing an error message about your iCloud Music library not updating. First, we recommend making sure you have a reliable internet connection on your device. Once done, check to see if Sync Library is turned on:

Sync music between your Mac and iPhone or iPad

We also recommend to take a look through this article If songs are missing from your music library after you turn on Sync Library for additional steps as well as the next steps if your music is missing.

Cheers!