When a meeting is scheduled using outlook and a room mailbox is selected as a resource, the room mailbox displays for a few seconds and then disappears.
- This issue occurs if an ampersand (&) character is used in the SMTP address of the room mailbox
- This issue also occurs if invalid working hours are set in the room mailbox i.e. the end time occurs earlier than the start time.
- For cause 1 please remove the ampersand (&) character from the SMTP address.
For cause 2 please open the room mailbox in OWA and correct the working hours or please use the PowerShell commands below to update the correct working hours.
Set-MailboxCalendarConfiguration -Identity username -WorkingHoursStartTime hh:mm:ss
Set-MailboxCalendarConfiguration -Identity username -WorkingHoursEndTime hh:mm:ss