iPhone says installed screen is not Apple

Either the screen that you installed is not a genuine Apple part.....or.....if it is, you did not install the screen correctly.

Apple does not parts to end users......unless they have established a separate account and have been approved for self service.

Where did you buy the part?

Did you purchase it from Apple? What is the source of the replacement screen? Counterfeiters use Apple Logo’s all the time. A logo is not a guarantee of authenticity.

Sounds to me like you installed it yourself.

You don't have legitimate access to genuine Apple parts.

If you replaced the display yourself, your phone is now unsupportable.

Learn → about Unknown Parts message and the learn about your repair options.

Good luck! 👋🏼😉

Smiliñ 😎 Brian