Open Stack

I tried to search the Internet but probably there is a million ways to
phrase this question..

Basically, assuming I have an admin credential, given a user name/id, is
there a way to get the list of tenants that user is in? "user-role-list"
seems to be an obvious choice, but it doesn't seem to work. As a user, we
can obtain an unscoped token, and get a list of tenants for the user. But I
want to do this as an admin.

Thanks.
-Simon
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