My company has a few resource room mailboxes. They all have the same settings, full permission, and policies. The mailbox control the rooms that are used for meetings. They all have calendars that are shared so you can view when you can book the room or not. Recently I found out that some of the users are not able to view some calendars. They are getting a permission error. The error says "You don't have permission to view" and it will ask if you want to ask to view the calendar.
I'm not sure what can be the issue as all the settings, policies are the same. Everyone in the domain should be able to view the shared calendar but they are getting a permission issue.
I can't remove the calendar and mailbox as there are some appointments are already made and that would cause problems.
So far I have verify that the default sharing policy are all the same. My company has it set to *.CalendarSharingFreeBusySimple. The shared calendars that are working have the same policy.
When I grant myself full permission I am able to view it. The groups and users are the same for the calendar that are working.
This is all I can think of and list as of right now.
Does anyone have a clue or give any suggestion where to start to find the problem and fix it?