If your tasks aren't sending email notifications, consider the following factors:
Ensure the tasks are assigned to the correct traveler type, such as 'Primary Traveler' or 'Full Access'. You might need to set it for all travelers or just the primary traveler.
Check if the trigger date has passed. Tasks set to trigger at 0 days before/after the trip won't run if the date has passed. Consider using a '1 day before/after' trigger for reliability.
Make sure the email notification toggle is activated in the task settings.
Additionally, a timing issue with the '0 days' trigger is noted, so using a '1 day before/after' trigger is recommended for proper notification timing.