Try reinstalling Apple music with its IPA file.

Run Sideloadly application on your PC or Mac.

Connect your iPhone to the computer via USB. Load the IPA file into the app to begin Enter your Apple ID. Click the “Start” button to begin sideloading. When prompted, enter the password for your Apple ID. Open the Settings app from the Home Screen. Navigate to “General” → “VPN & Device Management”. Click on the developer app associated with your email. Tap “Trust” to allow the Apple Musci app to run.