When trying to share a calendar via user name is does not work. The shared calendar doesn’t show up at all for user to share with. Also I’m getting a duplicate entry of the user I’d like to share the calendar with below the calendar entry in the side panel.
Deleting the user again and sharing the calendar via groups it works and the calendar is writable, too! But this is only a workaround because it grants all members of the group read/write access to the calendar.
Seems like membership of any group has no effect on this.
Anybody else having issues with sharing calendars to other users? Any fixes for enabling user based sharing?