I have same issue. This is 2nd winter for my T8 and first winter issue occurred only once, and this winter it has been already 3-4 times.
But first quick solution; I disconnect the cable from wall station, get it rolled, open side window and put the rolled end of the cable inside the car. Car's side remains connected to the cars port.
Now the car can be started. There is a warning that cable is connected, but if you keep ignition swich turned on more than 7 sec, the car starts, and it can be driven.
What I have done is I have driven it to the warm garage. And after couple of hours warm up, the cable can be disconnected normally.
It seems that the problem is something to do with freezing. MOst of cases is related to the wheather, when there is first rain or wet snow, and then outside temperature gets freezing. The car is outside and next morning the cable cannot be unlocked and unpluged.
Last service I complained about the problem, but service had no solution for it. They were searching TJ's but no solution for this problem.