At the moment in the Charge 4 you can't control Spotify while an activity is running.
I suppose the reason is that "Activity" and "Spotify" are 2 separate apps inside the Fitbit. Anyway, I suggest then to update the "Activity" App and include a section (scroll right/left) to include a Spotify control page. It's a useless function the ability to control Spotify if I can't do it while I'm running... Also, why I'm supposed to use my Fitbit when I'm not running instead of my phone?
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