I have successfully impersonate some user accounts by using the following REST API:
POST .../api/v1/auth
username=myadmin&password=myadminpassword&impersonate_username=myname
However, on some user accounts I am getting 403 - Forbidden: Access is denied. You do not have permission to view this directory or page using the credentials that you supplied.
My question is why I cannot impersonate all users?