I had the same issue when I took delivery of my 2021 4S. Next day returned to the dealer and described the problem to my sales associate and he was able to resolve it as part of the setup of the personal settings that are saved with your FOB. I don't remember the exact steps that he performed but it was something along the lines of putting the car in Reverse (brakes on, have the FOB with you) then adjusting the passenger mirror down to the position desired and then on the door (re)saved the personal settings (SET > 1). He mentioned that Porsche has been setting the mirrors in the up position for shipping from the factory.I have an odd issue in that during reverse, my passenger side view mirror goes up vs down. I am having this investigated by Porsche on Friday; but wanted to know if is was unique to my Taycan or is it more prevalent.