Lack of signal or none at all post screen replacement.

Did a galaxy s10 screen repair. I replaced the frame + display as one unit. Upon transfering over all known parts and following the ifixit guide I felt I did a solid job. Customer called a few hours later stating they had no signal on phone. Is there a hidden antena that needs to be transfered from old frame + display to new frame + display?

Parts transfered: Battery, main board, front facing camera, bottom loud speaker, wireless charging pad. I looked over old part and saw nothing left behind as only the side button switches remained.