Your answer is not accurate as I have the same problem as OP. I'm a user of a family account and one of the users in my account gets full lyrics to most songs whilst any other user in my account gets lyrics for ANY song. So this issue is unrelated to lyrics availability per song.
This is one of our new features that we're trying out. We’re always testing possible improvements and new features, so you might not always see something on the app your friend or family member does. We really value your feedback as it helps inform our decisions going forward.
Could you try to close and log out of the app twice as this force activates the feature on some accounts.
Let us know how you get on.
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“With freedom, flowers, books, and the moon, who could not be perfectly happy?” ― Oscar Wilde
same here! I have tried on 2 accounts on my iPhone XR (both premium plan) but the lyrics didn't show up for every song. My friend with an iPhone 11 has it, I tried playing the same song on my phone but it didn't show up either 😕 is this a model problem or account??
My experience is that you’re out of luck if the issue is with your account. Even if you contact their official support, they’ll first tell you that your offline cache has issues and that they’ll reset it but that doesn’t do anything. Then they’ll tell you to reinstall the app but that doesn’t fix it as well. Then they’ll tell you that they will look into it and get back to you but they never do.
Basically endless waiting without nobody actually taking the time to really look into the issue with your account.