Proxy calendars CalDAV access

Since 2014R2 Groupwise supports CalDAV and it works for the most part for my own calendars using the URL scheme https://groupwise.server:8443/principals/users/username.postoffice/calendars/Calendar/

But how can I access a proxy calendar with CalDAV? Replacing the user name in the URL with the name of the proxy user does not work.
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