Touch ID Not working after screen replacement, clueless?

So I replaced a screen with an original Apple screen on my iPhone 6 Plus. The home button extension cable did not make it when transferring it over so ordered a replacement and that has arrived, I fitted that in now, the home button works but the touch ID does not. I already had my fingerprint added into the phone before the screen replacement and it is still there, I have had no error pop up saying that touch ID failed to register so I know it's fine as it's been recognised. On the lockscreen it says 'touch id or passcode' to unlock but when i put my finger on the home button nothing happens. When I go to add a fingerprint there are no errors but when touching the home button no fingerprint image forms on the screen during the process of adding my fingerprint. My option for fingerprint unlock is also not greyed out so it must be fine? Does anyone have a solution for this, I made sure the battery was disconnected during the repair so it could not have been that.

Thank you in advance