If they try to access the manage.auth0.com, they don’t have access to the tenant, and if I try to add them as members, using the old invitation view, I’m informed this is no longer available.
yes, after reviewing the documentation I found the “Manage Tenant Access” functionality. It was not very intuitive, and my mistake was to try things without completely understanding them.
For people with the same issue I had, here is what you must to after inviting a new user to a team: