@TeamYouTube currently sub to YouTube Premium (which includes Google Play Music) & I've never had an issue but for some reason I got a refund email for my $11.99(even though I have plenty of funds) now I can't access my premium account (I hate adds) nor my music on GP.
Sorry to hear about the trouble – we recommend reaching out to our live support here: https://yt.be/help/purchases . They're the best team to help with subscription and billing concerns. Hope this gets resolved.