MAKE ABSOLUTELY SURE that you have taken the SIM card out at this point. I just snapped my motherboard in half at the SIM card point. Luckily it's the one that didn't work anyways...
As of right now, is it possible to get a replacement motherboard for the Pixel 6a? I spoke with a repair shop and they said the phone would need to be under warranty (which in the case of my wife's phone, it is not due to getting smashed in a car door) to get a replacement motherboard.
I'm in the same boat as mkirwin no amount of pulling with the suction cup worked, I had to use a razor blade to get the seam separated enough to insert a pick. Maybe I didn't heat up the adhesive enough but that stuff is super strong