to me it kind of makes sense that you have to wear it on your wrist for strength because in many lifts your biceps doesn’t do as nearly as much acceleration as your wrist. tbh i don’t mind putting it on for strength trainings, and I wish that would be the only issue.
they told me the same about wrist placement, i moved it a bit higher and the hr readings imnproved but it’s not nearly as accurate as my AWU.