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@laurent a quick search led me to this https://www.sogo.nu/support/faq/what-are-all-those-options-for-calendar-sharing.html would seem to suggest this might well be possible if each of the calendars have suitable permissions
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This should already work.
The owner of the calendar should set the rights appropriately in sharing for "Any Authenticated User":
Then you subscribe like this:
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Actually, this problem has already been identified upstream : https://bugs.sogo.nu/view.php?id=4547
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