My suggestion is to use ‘Print String’ node after input events to double check inputs/functions/events.
I just set this up in the Third Person Map. I used the Level Blueprint (In UE5 you can open level BP by clicking on the “Blueprint Nodes” button to the left of the “Clapper” icon.) To easily reference the VehiclePawn and Character.
One tricky part is selecting the right “IMC_Default” - just hover over the selections and select the one with the correct path.
Cheers to SupportiveEntity for reminding me about the ‘Event Possessed’ nodes.