Did you name the map with the ü?
If yes, this is the error. They don’t support special characters. I opened a ticket to let them know that 2 days ago.
Rename the map by replacing the ü by u… Then you can save it. And you can delete the extra ones…
Happened to me with French Characters (é, è, ë).
This is a super rookie mistake you learn in your first programming class (always specify your encoding when you have open text fields) but it seems they skipped that one too…