There is an approved ruling that covers fouls by Team A on an unsuccessful Try. AR 8-3-3 I:
During a try attempt, Team A’s legal kick, untouched and in the air,
has crossed the neutral zone when a foul occurs. RULING: If the
foul is by Team A and the try is unsuccessful, and Team B does not
gain possession, the try ends. If the foul is by Team A and the try is
successful, the penalty is at the previous spot. If the foul is by Team
B and the try is successful, score the point unless Team A chooses to
accept the penalty and attempt a two-point play. The try is exempt from
postscrimmage kick enforcement. Penalties for Team B personal fouls
on a successful try may be enforced on the subsequent kickoff or at the
succeeding spot in extra periods. If the try is unsuccessful, Team A may
accept the penalty and the down will be repeated.