I just looked at my documentation and on the 1J0 units, comfort windows via fob is listed at the three addresses 04283, 04289, 04295 and controlled by bit 3 = 0. 08628 is the front left door and, you are right, you do need to modify bit 2 to a 1 at this address, along with a few others, for comfort windows to work on the drivers door.
Here are the changes needed:
CCM:
04283, 04289, 04295: change bit 3 from 1 to 0.
FL Door:
08628: change bit 2 from 0 to 1.
FR Door:
12724: change bit 2 from 0 to 1.
RL Door:
16820: change bit 2 from 0 to 1.
RR Door:
20916: change bit 2 from 0 to 1.
If you are not able to read/write to a particular window motor, you may have a failing part, bad wiring on the bus between these motors and the main databus, or something else is not working correctly.
Have you tried KW1281Test over VDS-Pro yet?
KW1281Test