Auth0 dashboard/s SSO using Microsoft Entra (Azure AD) as IdP

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Hi,

I have read Configure Single Sign-on for Auth0 Dashboard

But I’m confused and have several questions.

  1. I have several tenants, how can I check which one is the root tenant authority?
  2. If one tenant has enterprise plan, but others do not, can I still setup SSO through the enterprise plan tenant so that all users in all tenants still need to go through the IdP ? Or do I need to make all tenants go on enterprise subscription to do this? - and if so , would I then need to make SSO integrations for each tenant?

Thanks for your help.