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I think that Tenant Management needs a delete box to kill off tenant administrators.
Ran into issues where an tenant admin needed to be removed, which can be done in Administrators, but the drop down box in Tenant Mgt. still kept the tenant admin's name in the dropdown box, and readding it added to that box, but wouldn't actually add because of the duplication. To clear the box I had to edit tenant.include where I found the admin's name twice. Then all went OK.
I second this request. It's an important feature.
The file you have to edit is /etc/asterisk/tenants.include, and look for the users= line for that particular tenant