iPhone 8 Home button not working

Hello,

I got a damaged iPhone 8 without iCloud but broken display and back, the old original display was not working at all, I couldn’t even test it, the cables were ripped. So I ordered a cheap screen from amazon to test if the phone is working and really iCloud free (no Sim tray so i didn’t knew the IMEI). Tested the screen without anything, just the screen. Worked perfectly! Then I installed the home button, but it doesn’t work at all, no Touch ID no home button, just nothing. Honestly I wouldn’t mind having no Touch ID, but the Home button and everything looks pretty good, I repaired many i-Devices in the last 5-7 Years, I’ve never broke the home button/touch id by removing it. Could this be the fault of the cheap screen? I mean it works pretty well, touch response is good, brightness and everything is fine.

I got the same error message with or without home button connected.

Hope anyone can help me out. Thanks