My Apple Watch won’t download my Apple Music
My Apple Music won’t download to my Apple Watch series 6 and it’s on the charger and I tried restarting my iPhone and my watch and nothing is working
Apple Watch Series 6, watchOS 7
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There is no requirement mentioned by Apple about the battery charge for synching music. The only requirement is that the Watch must be on its charger, which you have done.
There is also this article that mentions how to add music if you subscribe to Apple Music: Add music to Apple Watch - Apple Support
If this fails, try to un-pair your Watch and pair it again.
If it is still not working, I think you should reach Apple Support: Get Support