[uMap] Permissions of a umap : broken ?

[AFTOC 38]

Hello

  I wanted to restrict permissions to use my umap to only the users who 
know the link (so that the umap is not public) but I could not  : when I 
click, while being on edit mode, to the key which is at the bottom of 
the menu on the right, it only displays an empty screen ! It used to 
work, because I have done that before (I say that to tell you that I m 
not a beginner, and I think I know a little bit already), but now it 
seems to be broken ? Or there is something else ? Maybe Im wrong in 
doing something ?

  Can you check please ?

My umap is this one : https://umap.openstreetmap.fr/fr/map/macarte_247835

Thanks in advance  !