Has anyone seen a situation where a room accepts an invitation when the room is already booked? Both employees got the acceptance emails. I checked via PowerShell and and setting for Allow Conflicts is false.
We didn't find one that would work for us. We set our rooms to deny the series if the resource wasn't available for any of the meetings. It is harsh but it seems to have solved the double booking issue. We decided it was better than the confusion caused by the double booking.
We also are changing the responses from the rooms to say "Be sure you received the acceptance from the room, until you have that, the room is not booked."
I am wishing that the calendar invite would keep all the meetings if the room is available and only decline if the room is busy. Maybe someday.