I was trying to add a charging station but it failed with a generic error message that it failed and that I could try again later. I tried again later, but it never worked.
So, I looked into the web traffic and found this in the HTTP response:
AddressInfo position is not in the selected country (Australia)
Apparently Australia is the default country and when I didn’t change this I wasn’t allowed to add the station (the station was positioned in Sweden).
I think it would be helpful if this more specific error message was reported to the user in the error pop-up message.