Using an Office 365 group calendar in Outlook client
It would be very useful that if users who are not added to an Office 365 group as a member can also view a group calendar in Outlook client.
This feedback is based on a customer voice from support SR.
From the Ribbon, go to Browse groups, and find the group you’d like to view. From there, you can select Group calendar from the ribbon.
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@Steve - true, although an Exchange admin can "unhide" the calendar in such a case.
But this will not work if the Office 365 Group was created in Teams. By default Teams created Groups are hidden from Outlook.