Ubreakifix put an apple battery in my phone and my phone still says it’s an unknown part?

Battery Health settings will likely no longer function correctly......if they function at all.

Check Settings > Battery > Battery Health & Charging > Maximum Capacity

If the phone requires service, Apple will not touch this phone. The phone is also not eligible for trade in.

You had repairs done by a place not authorized by Apple so it is not known if they used genuine Apple parts. It also means they cannot verify the repairs with Apple to prevent issues like this from happening.

About genuine iPhone batteries - Apple Support