Hi guys to save you time and affort! Tried around a bit and in the end it actually worked. So what did i do, it is simultaneously simplistic and ridiculous. I changed the http settings from http to https and that was it.

Nevertheless, thanks to the support team but I was faster ;-)

Hi Sebastian,

I am very pround of you. Congratulation.

Yes, HTTPS is suggested for all websites, even if you already started to build it.