The new "Add Shared Calendar Feature" would be great when it showed up Details of Appointments. As I only see "booked" entries and don´t find options to mofify the view, it is useless.
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In general this depends on the level of permissions you configured when sharing the calendar, but adding @Julia Foran just in case.
OK, figured it out. It needs MailboxFolderPermissions. Fulll Access "only" doesn't work