I had so much trouble with this for a while. It turns out if you go to the Skeleton tree, towards the top there is a checkbox that says “show advanced options” when you click that, every bone will have 4 choices for translation retargeting. Most of the bones in the mannequin skeleton are set to “Skeleton” while the Arms skeleton are set to “Animation”. If you go in the advanced options in the Arms skeleton, and change all the bones except for root and pelvis to Skeleton for their translation type, that will fix the problem.
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