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Turn off "auto-launch audio apps" under Display & Brightness.

Sometimes this happens if you listen to audio on any of your devices, or even a family device
 
Have you tried a reboot? My watch occasionally just gets confused and shows the now playing icon for no reason. A reboot always fixes it.

Alternatively, what comes up when you tap the icon? Does it show anything in the Now Playing interface?
 
I finally got rid of it. Not sure what I did. Between the watch and watch app on my phone I played with a few settings and it finally disappeared. Thanx for responding.
 
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