Issue identified. We excluded hard bounces in the form of a list - but the list was empty after deleted all of the contacts. By removing that empty list, we were unblocked.
Still a little odd but thanks @karstenkoehler for jumping to help.
Issue identified. We excluded hard bounces in the form of a list - but the list was empty after deleted all of the contacts. By removing that empty list, we were unblocked.
Still a little odd but thanks @karstenkoehler for jumping to help.