External room reservation in Office 365.

External room reservation in Office 365.
I have created a meeting room called corner and I have enabled ProcessExternalMeetingMessages but when I try to book the room using outlook and enter the email room@domain.com as a room I get the standard error from ms: 550 5.0.350 Remote server returned an error -> 550 invalid mailbox

Is there a solution to this?

Thanks

Here's the output of get-CalendarProcessing:
RunspaceId                          : 8081e09a-71ed-4afc-bc28-c182165898e3
AutomateProcessing                  : AutoAccept
AllowConflicts                      : False
BookingWindowInDays                 : 180
MaximumDurationInMinutes            : 1440
AllowRecurringMeetings              : True
EnforceSchedulingHorizon            : True
ScheduleOnlyDuringWorkHours         : False
ConflictPercentageAllowed           : 0
MaximumConflictInstances            : 0
ForwardRequestsToDelegates          : True
DeleteAttachments                   : True
DeleteComments                      : False
RemovePrivateProperty               : True
DeleteSubject                       : False
AddOrganizerToSubject               : True
DeleteNonCalendarItems              : True
TentativePendingApproval            : True
EnableResponseDetails               : True
OrganizerInfo                       : True
ResourceDelegates                   : {}
RequestOutOfPolicy                  : {}
AllRequestOutOfPolicy               : False
BookInPolicy                        : {}
AllBookInPolicy                     : True
RequestInPolicy                     : {}
AllRequestInPolicy                  : False
AddAdditionalResponse               : False
AdditionalResponse                  :
RemoveOldMeetingMessages            : True
AddNewRequestsTentatively           : True
ProcessExternalMeetingMessages      : True
RemoveForwardedMeetingNotifications : False
MailboxOwnerId                      : Room
Identity                            : Room
IsValid                             : True
ObjectState                         : Changed
macxpresAsked:
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Vasil Michev (MVP)Commented:
The settings seem OK, post the full NDR message?
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macxpresAuthor Commented:
Hi Vasil,
Thanks for the reply, it was a spam-filter that didn't auto created the recipient and created the ndr.
Case closed.
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