Why is my touchscren unresponsive after battery replacement?

I replaced my battery following all of the instructions in the official ifixit guide and just before gluing the screen in place I decided to see if it was working so that I wouldn’t have to take it off again. The ipad boots up fine and the screen looks good but touching the glass doesn’t do anything at all. I tried rebooting and I tried disconnecting everything and reseating the connectors but it is completely dead to touch controls.

I really wanted to try repairing this thing instead of throwing it out since the battery was the only problem but now it feels like I did a lot more harm than good.