Can't change space details

Hi everybody,

I've a ne created space in my Confluence Cloud instance in which I want to change some space details. For that in the space I go to "Space settings" -> under "General" in "Space details".

Here I click on "More details" and I want add categories to the space or change the description or the Home page of the space. But when I click on "Save" i get this message.

I tried this changes with my space admin and also my admin accounts and in all of them I get this error.

So what is wrong here?

Thanks and best regards,

David