If a team member accidentally unsubscribes from a notification email sent via automation, you can resubscribe them!
Simply open the “Notify someone” action in the automation by clicking on it, click the email address that is unsubscribed, and select the Resubscribe Them button:

For step-by-step instructions, read the Help article.
To learn more about managing unsubscribes, listen to our podcast episode on managing unsubscribed contacts.