Hello @Easter_Seals_TriState ,
You may want to check and see if the original account owner's email address is still listed as contact in the account, or is listed as the From/Reply-to address, account's main address, or the account's billing address. Only another verified address can be used for these account elements.
The AO's contact card will be used for sections coded to insert contact details, such as greeting tags and the unsubscribe footer link, when doing previews and test sends. When you send out the email for real, that unsubscribe link will fill with the receiving contact's address.
... View more
