It is not possible to switch on the bar heating via remote control

You can’t turn on the heater via the remote control Hello! Now that I’ve been the proud owner of an A3 for 3 days (Suuuuuper driving feeling, even though I’m still in the drive-in phase), I try all the functions. Unfortunately I haven’t yet managed to activate the heater via the remote control. I set the timer1 to 08:00 a.m. 04., set a check in front of Timer1 and finished the car. Then I tried to activate the SH with the FB after a few minutes. First the FB lit green for a short time and then it flashed red in very short intervals. Then there was nothing more. At the car I did not do anything wrong. With Timer2 and 3 I tried the same thing. If I do a tick in the menu with the heater, it starts immediately, only with the FB somehow doesn’t work. Do I do something wrong?