The Power BI On-premise Enterprise Gateway allows for users to be added as administrators of the gateway cluster via the Powerbi.com portal.
One annoying quirk about this, however, is that at least as of this writing, it is impossible to add users (or groups) which do not have an email address via the user interface.
Attempting to do so will give the error message “These email addresses are invalid or duplicate.” Pretty annoying!

It turns out that it is actually possible to add objects which do not have email addresses associated with them (groups, users, even application SPNs), however it must be done with PowerShell.
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