Disable double jump

Triggered fires every frame. Use Started if you want a single action. You may need more force, though. Or tick Vel Change on the Add Impulse node.

This didn’t help unfortunately.

You may still want this; there is, indeed OnLanded event that could reset the DoOnce .

I am not getting any OnLanded events when looking through the nodes.

Btw, the character class already has Jump functionality. Are you actually using a character class, though? We see you attempt to bounce a ball.

Yes, I am farily sure I am using a character class. I followed the video I linked to.