Share meeting room with shared organization

1. $UserCredential = Get-Credential

2.  $Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $UserCredential -Authentication Basic -AllowRedirection

3.  Import-PSSession $Session

4.  Set-CalendarProcessing –Identity calendar@mydomain.com -ProcessExternalMeetingMessages $true

5.  Enjoy!