Wwise Bus RTPC not updating in Unreal

Question

Hello,

I'm trying to implement a volume slider in unreal so the other members of my team can set the volumes of music / sfx to their liking during editing, I feel the best way to do this should be an RTPC on the buses. I have set up a blueprint to call this RTPC, but it seems something isn't connecting and my variable isn't making the RTPC react.

I'm calling the name correctly in the blueprint, and Wwise profiler isn't showing any changes to the bus RTPC on start.

Do I need to set the RTPCValue object reference somehow?

Wwise 2021.1.8

UE 4.27.2