I created a room called 'TEST'and I want all users belonging to a site called "german" to access to the calendar (ReadPermission)Also, in that "GERMAN" site I would like need the "user1" and "user2" to have full access.I would like to know how I could provide the readpermission to all the user in the "GERMAN" site for the 'TEST' room??I tried to set only one user (user123) and I got the below error:Add-MailboxPermission -Identity 'TEST' -User User user123 -AccessRights ReadPermissionYou do not have permission to open this mailbox. For access or for more information, contact technical support for your organization.It seems like it has worked for the user1 and user2. I ran that below shell command:Add-MailboxPermission Identity 'TEST' -User user1 -AccessRights FullAccess Allowed> -InheritanceType allCould you please help me out with that? maybe the shell command for the read permission isn't right..