Questions for clarification:
Are you booking rooms using the eTASK.Outlook add-in? More information 📄 Hinweise zum Hinzufügen von Räumen zu einer Besprechung außerhalb der Add-In-Funktionalität IC1991
Is the room selection disabled?
Did the appointment already exist, and do you just want to add a room later?
Have you invited other people to the appointment?
Solution:
Add another participant (can be deleted immediately afterward).
Select a room for the event. The selection becomes available immediately after adding the participant.
Check this out too:
📄 Hinweise zum Hinzufügen von Räumen zu einer Besprechung außerhalb der Add-In-Funktionalität IC1991