When I try to navigate to that address, arrive to DELVE user profile. I suppose this is not the problem, because I tried to change the user, and error message is exactly the same. I tried to setup a Group, and reteruned same messagge.
I tried REMOVE ALL PERMISSION FROM ITEM, and it works fine, but when a use GRANT EDIT PERMISSION on USER X, it doesn’ t works. It seems that GRANT/REMOVE PERMISSIONE ON USER X doesn’t works.
I use following syntax, found in an article of your blog:
REMOVE edit PERMISSION FROM ITEM current element:id IN LIST working context: current list FOR USER OR GROUP user@domain.it