Thanks for reaching out about this in the Community!
This is one of our new features that we’re trying out and is still in test phase. We always test possible improvements.
What you can do is try logging out and back in twice as this reactivates the feature for some users.
If that doesn't work and you really want to have the lyrics feature on you phone, you can try to to create a new account and check whether it's available there. If that's the case follow the instructions in this Guide to transfer your Music collection over so nothing gets lost.
Hope you find this info useful. Don't hesitate to reach out again if you have questions.
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