I have been able to invite members from other AGOL organizations to join a group within my own AGOL organization. But I don't seem to find a way to do the same between AGOL and Enterprise - neither inviting Enterprise users to an AGOL organization nor inviting AGOL users to the Enterprise group. Any leads or is it just not possible? All the sharing documentation I found so far seems only to cover AGOL-AGOL invites.
I have seen the details on setting up a collaboration but I would just like to share content. Or is a collaboration the only way to do it?