In this article, I’ll show you how to enable Exchange Meeting Rooms Calendars to auto process \ accept calendars request from users In Exchange Online In hybrid mode.
Recently, I have configured a client to work In Exchange Hybrid (with Exchange 2010) and we noticed that when users In Exchange Online sent a meeting request to book a room the request was not accepted and the booking was not made.
In order to fix the Issue, I had to allow the room to accepts meeting requests from External users (Hybrid).
The cmdlet below will fix the Issue and needs to run on the Exchange 2010 Server meeting room.
Set-CalendarProcessing Room -ProcessExternalMeetingMessages $True