Problems with proximity/front cable not working

I was recently experimenting on fixing an iphone 6. I have worked with iphone 4- all the way to iphone 5s.

I did realize the touch id sensor is no longer connected at the bottom when i open the iphone 6, which was great and easier to open up. I was able to complete the repair, everything seemed to work fine, when I took the phone to the customer he had a lock on the phone. When we were going through to see if the functions all worked and the whole proximity cable features were all disabled. I wasnt able to fix the problem but do know that i went through the process of conncecting and reconnecting everything multiple times. I noticed that I forgot to transfer the Prosimity sensor bracket, and also had the digitiser cable on top of the metal shield instead of under.. I wasnt able to get the phone back cause they were upset that the mic, phone speaker phone, front camera and touch id functions were not working..some further information, i was working on a black iphone, i bought a pretty good qualtiy white screen for the fix... any info would be helpful, i checked all connections all seemed to bein good conditions, display cable was slightly bent from countless reassemblies.. but dislay still worked, just the parts on the front camera flex giving me issues, any info, replys would be greatly appreciated..