Room calendar shared with external users

[AtanasM]

Room calendar is visible by external users, but no any items are shown. The external domain is federated in Exchange admin center.

[#2]

Hi @AtanasM 

connect to exchange online PowerShell and run the below command.

Get-Mailbox "room

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name" | Get-CalendarProcessing | Select *external*

if it returns 

ProcessExternalMeetingMessages
------------------------------
False

then you will have to run the below command.

Get-Mailbox "roomname" | Set-CalendarProcessing -ProcessExternalMeetingMessages $true