The screw and required driver are NOT T4 but Torx Plus 3IP (Torx 3 will do the job) according to the MS Service Manual (856727 Microsoft Surface Surface Pro 8 Service Guide - linked at the product page here at ifixit.

This is NOT T4 but T3! At least for my SP8... MS says it's Torx Plus 3IP:

856727 Microsoft Surface Surface Pro 8 Service Guide

Look at Step 14, the connectors seem to be different, at least at first sight. Why do you want to take that risk, by the way?

For model A1229, you have to disconnect the two additional connectors. Both are small with a black and grey cable, like the one in the top middle on the photo.


The first is located between the large display data cable and the fan connector, the second is located near the two connectors marked at the top left of the picture.