Possible to have upper arm behind torso, lower in front of the torso and work with Body Tracking?

Hi all,

I've been able to get the upper arm behind the torso and lower arm above torso via dragging method BUT I'm struggling with making it work using body tracking. For some reason, it doesn't work when set to body tracking and the upper arm does not track at all, just the lower arm tracks and it breaks at the elbow. Does anyone have any advice? I've already followed this tutorial and it doesn't work for body tracking. Thanks in advance!