I have a list of people to whom I sent an email. None of them are marked as Unsubscribed, but the ones that have a value in "Unsubscribed Cause" did not receive the email. I'm trying to reconcile why they met the criteria of the workflow (In list of email addresses, not unsubscribed, not invalid, not suspended). I know some are due to duplicates but I'm wondering if the Unsubscribed Cause is an issue.
No. this field is not enough, AFAIK. Duplicates in the smart list or communication limits are more likely
Also, your list does not show: