Hi Gareth, thanks for your reply
I was just hoping to save a 40mile round trip journey (diagnostic and order up a part) if someone out there had the same problem and maybe it is something simple that I have missed on the MMI. My previous 2017 A6 did not have the same technology. However, my wife did read on an audi forum (cannot find it now) that a lady had the same problem but could not replicate it at the dealership but fortunately the cocky technician managed to lock both of them in the car when testing opening the door from the inside! I have read of other vehicle makes (older) having the same issue as myself. The problem with mine is its intermittent and annoying if you are in a hurry to leave the car. The front passenger door seems ok but have not yet tested the rear doors. In my previous car as a matter of routine I would hit the unlock switch for all doors if I had passengers.
Kind regards
Mike