First option will be "Music Providers". Go into that menu option. On my watch I only have music I have moved over so it gives me two options in this menu, "My Music" and "Control Music on Phone". Tap the "My Music" menu option. That should fix it. That was my issue. The controls were set to "Control Music on Phone". Read more info about GARMIN Vivoactive 3:
Performing a factory reset on your Garmin Vivoactive 3 or Garmin Vivoactive 3 Music will completely remove all user data and user settings. Perform the steps demonstrated in the

Bring your smartphone within 10 m (33 ft.) of the device. On your smartphone, open the Garmin Connect app, select or , and select Garmin Devices > Add Device to enter pairing mode. Hold the touchscreen, and select Settings > Connectivity > Phone > Pair Phone. Troubleshooting.

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  • garmin vivoactive 3 music reset