Thanks. I have a non-Apple screen due to the original being damaged. The phone is working fine.

That notice is not going to go away for a long time.....if it ever goes away. The shop.....not authorized by Apple.....installed the wrong part.

Because a non-genuine part was installed by an unauthorized person or shop, Apple will now refuse to even look at your phone in the event of any future problems.

In effect, if there was any remaining warranty on your phone, it is now voided.

You'll have to live with the notification. You don't have an authentic screen. You have also made the phone one you cannot trade in to Apple, nor get service support from Apple on the phone. If you ever choose to sell the phone, you need to be up front with anyone interested in the phone, that it was serviced with an inauthentic screen, which would reasonably greatly reduce the phones resale value or discourage anyone from buying it.

You don't. Ever. Apple won't touch it. Your phone us unsupportable.

Possibly true, if “working fine” does not include True Tone or auto-brightness.