Thanks for confirming.
Can you please try logging in with the same Apple ID in a browser at https://music.apple.com on a Mac or PC and check:
- Does that work?
- After login do you see a banner at the bottom saying “Get over 100 million songs free for 1 month” or similar?
- When you click on your account icon in the top-right corner and select “Settings”, scroll to the bottom where it says “Subscriptions” – what does it say here?
Thanks for your help!