For AD authentication you need to have a group;
"For active directory authentication to work, a group must be created (see Add Groups section) with the same name as the active directory group that needs to have access to the ESMI. For example, if you name the active directory group "McAfee Users," you need to go to System Properties > Users and Groups and add a group named "McAfee Users.""
I also see for radius that;
"Access groups must be set up on the ESM before using RADIUS authentication. These access group names will be used when configuring the RADIUS server. When a user is authenticated, the RADIUS server returns a list of the user’s allowed access groups, so the access group names on the ESM and the RADIUS server must match for a user to have privileges on the ESM. This is case sensitive."
There is additional information in KB74810
If you are still having an issue with this then I would recommend contacting support and logging a ticket.