I'm having trouble giving another user access to an organization group calendar. I have created an organization group of two people (me and another user) who are both admins of that group. As a member of this group, I can access this organization group's calendar on the Zoho Mail web interface as well as on the Zoho Mail iPhone app. However, the other user can only access it through the Group interface, but the Group Calendars section is empty in the web interface, and the calendar doesn't show up in the iPhone app as well. I need him to be able to access it from the Zoho mail interface and especially the iPhone app the way I can.

What should I do? Help will be much appreciated!