IPhone repair issue

Please i will be glad if anyone can help, i am a mobile technician, during the process i was fixing an IPhone Xs Max, the earpiece speaker/ face id sensor flex has a little cut, causing the speaker not to work but the face id is still working, please can i get a replacement for both to work properly again, because when i try replacing the flex the earpiece speaker started working but the face id does not work. I will be very glad if anyone can help me on this issue thanks.