Thanks to the Information and the time provided from @Mackensen 🙏
we could find out the problem (🚀), which was quite an easy reason but kind of the last thing, that we could think about. Indeed.
The cause was, that the website doesn’t load if in the incorrect time zone.
Tomorrow, in the early morning (Time Zone of … Berlin, Bern, Rome,…), we deploy a Hotfix. It then should be allright!
Many thanks for the help!!
SBB Community Manager