Currently, if a password expiration policy is set on the account level, no notifications are sent to Users notifying them when their password is nearing expiration. It is most common to see this alert sent 10 - 15 days prior to their password expiration so they can plan accordingly and set their new password ahead of their expiration date without interrupting their workflow

Sending an upcoming password expiration notification email to Users of their upcoming password expiration would be incredibly helpful from a user experience and additionally help Admins stay ahead of password expirations surrounding webhook integrations that leverage user authentications.