Proxied users cannot be added as a member of a grouped user.
This is because a proxied user is securely authenticated by another AuthAnvil server, the local AuthAnvil server does not have access to the user's details. Without access to these details, the local AuthAnvil server is unable to determine whether a proxied user is supposed to be a member of a local grouped user, and will fail to authenticate. Because of this, the system will not allow proxied users to be added as members of grouped users.
If you have any questions or need some help, we would be happy to assist. Open a case at kaseya.zendesk.com .