Whilst designing the administration console for support staff I came across the following issue.
When specifying more than one server in the discovery list for custom administrators and error message appears with the following text.
"another discovered farm has the same name as the farm to which this server belongs. Connecting to different farms with the same name is not supported"
Now, these servers are both in the same farm, but for some reason using a custom administrator it does not work.
After looking through the custom permissions provided to these administrators I found that adding the following permission fixed the problem.
"View Server Information"
Make sure when applying this setting you click the button "copy to subfolders"
Once this has permission has been granted, subsequent discovery attempts will work correctly without errors.