Solution:
The only way to delete the group is using Api Post method and adding %20 (encoded space character) at the end.
Browser Itself does not send %20 (space) thats why fails to rename or delete something that actually doesn't exist. .
I don't know if this happens only to me, but i tried everything, android, chrome, firefox ...etc with no results.
Steve wrote: Solution:
The only way to delete the group is using Api Post method and adding %20 (encoded space character) at the end.
Browser Itself does not send %20 (space) thats why fails to rename or delete something that actually doesn't exist. .
I don't know if this happens only to me, but i tried everything, android, chrome, firefox ...etc with no results.
Now I see where is your problem. You have space at the end of group name. I can replicate that. If space is in middle it works. I will fix that.