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When I was rigged my avatar to humanoid I was having these error with the arms and finger.
I was told to maybe rename them but that didn’t help
can you show the full screen?
if anything do Enforce T-Pose
@noir
Go to Pose and do Enforce T-Pose
that should fix it
If enforce t-pose didn't fix it, I had the same issue and I had to rename each finger bone since unity was being picky.