Hello,
I recently had a Reminder email go out that was set to Task Participants go out to about 30+ people which leads me to believe I misunderstood the meaning of the "task participants" option.
When I configured this I assumed that meant whoever the task was assigned to, whether it be a user or a team, but instead it seems to have sent the reminder to everyone who has permission to access the task.
For now, I've changed this to send the email to the previous submitter since that works for this particular scenario, but it would be far more helpful to send the reminder to who the task is assigned to (i.e., if directly to a person, then just that person, if to an entire team, then the entire team, etc.).
UPDATE: The reminders do work as expected, and some user activity with regard to the task assignment actually caused the unexpected behavior.