Impossible to delete user from realm custom function

I have tried to delete a user from my app (java in Android) by calling the custom realm function defined at that link:
Manage User Accounts — Atlas App Services (mongodb.com)
But nothing happend. When I chek he Logs on Realm App Services. It says “Status: OK” and show me the good name of the calling function.

What could I do? Is there anyone having the same issue??