Blunder Policy didn't trigger

My Ambipom (PGO)'s Blunder Policy (BRS) did not trigger despite flipping a tails on the coinflip for its "Full Tilt Fling" attack.

The turn I attached the Blunder Policy (this Aipom evolved into Ambipom and attacked later):

scoot404's Turn
scoot404 drew Cherrim.
scoot404 played Arven.

• scoot404 drew 2 cards.
  • Poké Pad, Blunder Policy
• scoot404 shuffled their deck.
  scoot404 attached Blunder Policy to Aipom on the Bench.
  

The turn I used Full Tilt Fling and got no draws from Blunder Policy:

scoot404's Turn
scoot404 drew Cherubi.
scoot404 played Fisherman.

• scoot404 moved scoot404's 3 cards to their hand.
  • Basic Grass Energy, Basic Grass Energy, Basic Grass Energy
  scoot404's Cherrim used Spring Bloom.
• scoot404 attached Basic Grass Energy to Ambipom in the Active Spot.
• scoot404 attached Basic Grass Energy to Ambipom in the Active Spot.
• scoot404 attached Basic Grass Energy to Ambipom in the Active Spot.
  scoot404's Ambipom used Full Tilt Fling on nickp87’s Teal Mask Ogerpon ex for 60 damage.
• Damage breakdown:
  • 1 heads: 60 damage
• scoot404 flipped 3 coins, and 1 landed on heads.
  nickp87's Teal Mask Ogerpon ex was Knocked Out!
  Wishful Baton was discarded from nickp87's Teal Mask Ogerpon ex.
  Wishful Baton was activated.
• nickp87 attached Basic Grass Energy to Mega Meganium ex on the Bench.
• nickp87 attached Basic Grass Energy to Mega Meganium ex on the Bench.
• nickp87 attached Basic Grass Energy to Mega Meganium ex on the Bench.
  scoot404 took 2 Prize cards.
  Basic Grass Energy was added to scoot404's hand.
  Basic Grass Energy was added to scoot404's hand.
  nickp87's Mega Meganium ex is now in the Active Spot.

The opponent's Teal Mask Ogerpon ex had a Wishful Baton attached that triggered around the same time as my Blunder Policy, and it acted correctly in letting them move 3 Basic Energies from their KO'd Teal Mask Ogerpon ex, but my Blunder Policy never triggered before nor after their Wishful Baton. I received my 2 prizes, but nothing else. Their turn began immediately after they promoted Mega Meganium ex to the Active Spot.