I would watch the Finals, but I don't subscribe to ESPN. I do have access to DirecTV Stream through my partner's dad's account. However, ABC is currently unavailable because of a contract dispute.
ABC is likely unreliable on your DirecTV because of a major ongoing contract dispute between DirecTV and the broadcaster E.W. Scripps Company. Since late May, carriage negotiations over fees have stalled, resulting in a nationwide blackout of 54 Scripps-owned local stations across 36 regional markets. If you live in one of these impacted markets (which includes cities like Phoenix, Las Vegas, Tampa, Denver, and Detroit), your local ABC affiliate has been pulled from the standard DirecTV lineup.