Coex: Users in outlook add room as participant - invitation does not arrive in resource database in Domino

We have a Lotus Notes and Exchange Online coexistance and are migrating users step by step to EXO. The resources (rooms) are still on Domino and have been provisioned as contacts.

The Outlook users have to add a room as participant to a meeting, free/busy is working. On the Domino side the resources are owned and the owners have to respond to accept the invitation.

But the owners are not notified about the invitations and the invitations do not show up in the resource calendar.

What types of resource ownership / response on Domino are supported in coexistance? Only automatic processing? Or other variations as well? If so, are we missing a config detail?

We are on the most current version of Quest software.

Thank you!