Daikin Onecta (Cloud) Binding [4.0.0.0;5.0.0.0)

Same issue here. I cannot connect anymore to the Daikin Onecta account. It always ends up here:

After giving permission to the “OpenHAB Onceta Binding” the reply from http://home.myopenhab.org:443/onecta/success is a “400 Bad Request”.

Any idea, what coud go wrong in my set-up?

Thanks, Alexander for your support and the work on this bindung!