This solution is to be performed by a system administrator

Issue:

When viewing a Room Calander in outlook you only see "Busy" and would like some more information

Solution

1. Connect to Exchange Online with PowerShell. 

2. Setting the Room calendar to show more details by default

Set-MailboxFolderPermission -Identity dco.office2:\calendar -User default -AccessRights LimitedDetails

3. Enable Room calendar to show subject of the meetings
Set-CalendarProcessing -Identity dco.office2 -AddOrganizerToSubject $true -DeleteComments $false -DeleteSubject $false

Note this will not show you information for past events, only newly booked events. 

Credit:

https://blog.ctglobalservices.com/office-365/bfa/enable-users-to-show-calendar-information-of-room-mailboxes/