Apple One Premier plan, Family Sharing for Apple Music

Hello there,

I've purchased an "Apple One Premier Plan" to share with my wife. I'm not able to get Apple Music working on her phone unless we sign in with my Apple ID. I have Photos and iCloud Drive working wonderfully.

When I check in my "Family Sharing Settings" her Apple ID shows Apple Music as one of the shared features.

When we look on her phone under Settings -> Apple ID -> Family Sharing it shows Apple Music listed as a service she has access to...

When we open Apple Music on her phone and try to play a song it asks her to sign up for a free trial.

When I click the account button at the top right of Music is shows that she's signed in to her account...

It's the same Apple ID listed here as it is when we look under family sharing in settings...

What should be our next steps to get this working? I'd prefer for her to have her own Music set up...