Apple music not syncing

I am signed in on a different apple ID for iTunes and AppStore on my main phone, and I'm trying to sync my apple music because I want to listen to music. I used both of the Apple ID's and neither of them are syncing. I am in a family plan and it says I need to subscribe again. I think I have 2 separate accounts in apple music because it isn't showing my library but someone else's. Is there anyway to access my Apple Music Library?