OT, first possession a face mask foul on the defense on a touchdown play. The R stated "by rule" only enforcement spot was the try. Wasn't this a rule change this season?
Yeah, that helps. As Legacy says, the 2020 rule change would allow Team A to enforce the penalty on the try, or, at the succeeding spot for Team B's possession - Team A's choice. In these circumstances, 99.99% of the time, I'm certain A would penalize at the succeeding spot. Maybe 100% of the time.
In my experience, when you have a rule change on something so unusual - and somewhat complex - most people will remember the old rule. Then, when folks let them know they messed up, they never miss that again (for other 2 times it might happen to them in the next 10 years).