One solution is to go into the PHP iCalendar config file and add the tasks iCalendar with your username/password to the ‘$list_webcals‘ setting. It should look like this:
$list_webcals = ‘http://username:firstname.lastname@example.org/tasks/ics.php’;
After you do this, you then need to change line 7 in the calendar.php page to from this:
$URL = $custom->ical_URL."month.php?cal="
$URL = $custom->ical_URL."month.php?getdate="
The ‘tasks Webcal’ should show up in the drop down of Calendars.
I should make this a setting and add these notes to the poor neglected docs.