Why aren't my notes showing on my task?
Notes and attachments are Premium features on Todoist, so you will need to purchase Todoist Premium in order for notes to be passed on by your Zap.
Completed sub-tasks aren't triggering my Zap.
Sub-tasks do not trigger when they're completed but rather when the parent task is completed. Sub-tasks will not trigger until the Task is checked off at which point two Zapier trigger events will fire.