Tasks in your phone calendar
Subscribe once and every open task with a deadline shows up in Calendar on iPhone and Mac, or in Google Calendar.
Under Tasks, open Task calendar. Every open task with a deadline that is assigned to you or to anyone is in it. A new task appears by itself; a task that is done disappears.
iPhone, iPad and Mac
Tap Subscribe in Calendar and tap Subscribe when Calendar asks. New tasks appear within the refresh interval of Calendar.
Google Calendar and others
Tap Copy link, then in your calendar add a calendar from a URL and paste it.
A new link
New link makes a new address and stops the old one, also where it was shared. Use it when a link has gone to someone who should not have it. Add the new link to your calendar again.