Backlog Paladin of Atonement does not trigger

[panterq]

I've cast Paladin of Atonement in the Ixalan Block Flashback Draft match, on my turn 3. Opponent attacked me on his turn 3 with a Hardy Veteran, dealing 2 damage. On my turn 4, Paladin's ability did not trigger in my upkeep, and neither it did on the subsequent turns.

League #7064, Match #254783369

 

[Conjurer77]

confirmed, never triggers...