Touch id not working after screen replacement

I just finished up screen replcement and everything went well except now my phone cant activate touch id. I did try to peel the ribbon off of the back off the shield and im wondering if i would be able to damage it without any visible damage? I put it back in position and swapped over every part. The old screen didnt have the little shield as someone stated in another post, all the parts are there and everything came apart easy since i replaced the screen a few times already. I really dont just want to throw parts at it