My 2017 1.4 TSI estate just started doing this. Pressing the opening switch in the tailgate does nothing. If I press and hold down the middle button (boot unlock/open) on the key, it releases the boot latch so that I can open it. It seems to occasionally work, but most of the time it does not. So I suspect the connector on the back might have come a bit loose after years of opening and closing the boot. Although it is a very low mileage car. So maybe it's just age on the switch. I may try to replace the switch; or at least re-insert the connector if I can get the inner part of the tailgate panel to get to the switch from the inside.