Tank flap cannot be opened by remote unlocking

?Moin to the country, I have the following problem: The tank flap can no longer be opened by remote unlocking at the driver’s door. I have already renewed the “pin” in the tank flap, since the old “pin” was already glued. Unfortunately this did not help. Does one of you have an idea like the problem to solve? At some point I will have to fill up again.