Need help understanding "Replace Existing" transformation node

Out of curiosity, have you tried using the IK Retargeting function in UE5 to solve this?

I have not. I’m learning as I go, I was unfamiliar with it.

I’m trying to apply your solution now. I think I’m doing something wrong. Here’s my “final” BP:

I added an input variable to get the first index joint rotation.

Here’s my actor BP, after I apply the tracking data:

“Left Hand” is the final one, “Holo Hand Skeletal Mesh Left” is the one getting the tracking data. The issue is that “Get Socket Transform” doesn’t seem to be changing.