Issues with Garmin Explore and Instinct

I called in a support issue on how my Instinct stopped syncing activities to Garmin Explorer.  That was three months ago.  I have gotten no response from support since my initial phone call.  Can anyone in this forum give me a direction to go to get my Instinct to work with Garmin Explore.  (It did in the past, just stopped one day and has never worked since.  I have reset it, updated firmware, nothing works.  The activities are getting synced to Garmin Connect just fine.