This is how I solved the problem and thought I would contribute:
After I disassembled the phone, changed the front panel and reassembled the phone, the touch ID did not work.
I then reopened the phone, disconnected the battery, twisted the phone so it was lying in reverse with the screen facing down and the bottom of the phone standing in 90 degrees. Then I removed the home button bracket (shown in step 22), disconnected the home button cable connector (step 23), connected the home button cable connector back again and this time it sort of “clicked” into the socket and when I pressed on the top of it again a second time it felt like it sort of clicked into it one extra time or further into it.
Then I put the home button bracket back on again, connected the battery, switched the phone on and the touch ID works.
