Hi @David Zona ,
The "Restricted Tenant" setting usually means that on your organization's side that tenant is not a permitted tenant. In your home tenant, the setting needs to be updated to allow the other tenant.
If the configuration of tenant restrictions was done on the corporate proxy infrastructure, admins can access the tenant restrictions reports in the Azure portal directly under Azure Active Directory admin center > Azure Active Directory > Tenant Restrictions.
The instructions in Use tenant restrictions to manage access to SaaS cloud applications show how to set up a permitted tenant list using the Restrict-Access-To-Tenants HTTP header.
That said, there is another reason why you might receive the "Restricted Tenant" message even if the tenant is not restricted. If the user account does not exist in the tenant but is able to access the tenant through an access weblink in the admin portal, the user will be able to "hit" the tenant but all actions will be restricted. If this is the case, you will also see the error message you described and you will need to make sure that account is added as an invited guest to the "restricted" tenant.
Let me know if you have further questions!
Marilee
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