home button wont work after screen repair

I had damaged my iPad 5th gen screen and digitizer and replaced with a 3rd party unit. (Factory home button was not usable) everything works but home button.I returned the first cheap eBay screen with pre installed home button, because I assumed the button or ribbon was junk. I then ordered another cheap screen with built in home button from another eBay seller, same issue. Screen and swipe work great, home button doesn’t work at all. Checked cable connector all looks good, however, when plugging ribbon into connector, the Siri ball will come onto the screen. But home button won’t work at all. Am I missing something there?????