creating new tenant - adding tenantadmin

when i create a new tenant logging in as administrator@vsphere.local

and try to add tenantadmin when doing a search

I see 2 tenantadmins

tenantadmin@ad.lab

tenantadmin@tenant1

For this tenant I called it Tenant1

where does tenantAdmin@tenant1 come from?

I dont see this user in AD. I only see tenantadmin@ad.lab

and I was not able to login as tenantadmin@tenant1 or tenantadmin@tenant1.ad.lab even when i add that in

If I used tenantadmin@ad.lab

it works fine