I'd be happy to piggy-back on whatever Tenant functionality you have. But of course a User cannot be interpreted as Tenant in any case. It's typically designed to provide some data separation between separate Organizations, each with multiple Users. And with some of the Users potentially members of multiple Organizations. Ideally also with different screen branding per Organization.
I'm speculating, because there's nothing in the doco on the subject: searching for Tenant brings up 0 results.