OpenHABian 3.4 Wolf Smartset Binding - "Account" Thing Authorization failed

I would like to use the Wolf Smartset Binding.
The Account-Thing doesn’t work.
I’ve double checked Username and Password many times with that auth data I’ve use für https://www.wolf-smartset.com/
But thing status is always offline (communication error) Authorization failed.

Wolf Device is a CGB-2 with an ISM7 FW 2.10 inside.

https://www.wolf-smartset.com/ works fine with it.

I tried:

  • restart OpenHABian
  • remove and reinstall wolfsmartset binding
  • delete and re-add account thing
    but nothing would help

Now I have no idea what I’m doing wrong with OH3 and Smartset binding.