Unable to access Apple Music after MTN airtime billing subscription

Check subscription status on your Apple ID

On your iPhone:

Settings → Apple ID (your name) → Subscriptions

Check if Apple Music shows:

• Active → problem is login or sync
• Expired / Not Found → Apple did NOT receive MTN activation

MTN has to resolve the problem for you since you are paying them for the subscription. It requires linking the subscription to your Apple Account and using that account for your Apple Music subscription. This is a common problem that MTN deals with all the time, even though many times they tell you it is not their problem so it must be Apple.