Home button doesn't work after battery and front sensor replacement

I replaced my battery but I ripped the front sensor cable, so I replaced that also.

Upon reassembly, I am unable to get the touch sensor button to work. No click, no wake, no response at all, and obviously no fingerprint sensing.

I've had the phone apart and back together several times now, attempting to reseat the connectors, but nothing has resolved the issue.

All other phone functions are fine. No screen issues, front and back cameras work, earpiece works, speaker works, ambient light sensor works.

I didn't disturb the button assembly at all…where should I look next?