Microphone Not Working iPhone 7

hello!

i got two iphones 7, one jet black iphone in prestine condition but it had icloud lock on it, i wanted to check if all the parts worked on it cause i got another one, a black 128gb one without icloud lock on it, on ios 14.3 but with a cracked screen and supposed with not working microphones

i changed the screen with the home button, front camera assembly succesfully, changed the housing with the jet black one cause this one had more scuffs on it and i loved the jet black one

during the transfer i didnt transfered the charging port cause on the jet black one the microphones worked perfectly but everything to no avail

can it be the audio ic chip on the motherboard? the loudspeaker and ear piece speaker are working perfectly, they were before but the old one had a lot of dust near the crack which was around the bottom right of the screen, below lcd (an actual hole)

i mention that any lightning to jack adapter isnt registered, everything except microphones are working as they should