I can’t get Killer King Achievement



I changed my name from ptr_AI to SacrificePawnAlways.

Tell us what you have already tried to do to get it
Your king must do the last checkmating move in a game
Just like the king of @PrincessCheng did here:
https://www.chess.com/game/live/105654693613

I can’t get it even tho I checkmated with king.
I played until this position just for the award. But they ain’t give me da award
i think thats against the rules