Tado home controller pairing won't work

I want to operate my Tado radiator valves via the home controller integration. I only get the error message that the code is incorrect every time when entering the homekit pairing code. I enter the code as xxx-xx-xxx and I am sure that the code is correct. I have already done a Factory reset on the bridge 2 times and completely reset the tado app, unfortunately this does not give any improvement. Does anyone have any tips for me?

This worked for me.