Room Calander showing as busy..

https://community.spiceworks.com/topic/1964048-changing-view-permissions-for-conference-rooms-calendars-in-office-365

https://jasoncoltrin.com/2017/06/21/office365-outlook-room-calendar-not-showing-details-displays-busy-only-fix-when-set-mailboxfolderpermission-does-not-resolve/

$users = Get-MailBox | Where {$_.ResourceType -eq "Room"} | Select -ExpandProperty Alias
Foreach ($user in $users) {Set-MailboxFolderPermission $user":\Calendar" -user Default -accessrights Reviewer}

of als je het per room wilt instellen met het subject erbij kies je voor deze:

Get-MailboxFolderPermission roomname@domain.com:\Calendar
Set-MailboxFolderPermission -Identity "roomname@domain.com:\Calendar" -User default -AccessRights PublishingAuthor
Set-CalendarProcessing -Identity "roomname@domain.com" -AddOrganizerToSubject $true -DeleteComments $false -DeleteSubject $false