Hello @dirtyharrywk, let me start by giving you a warm welcome to the Fitbit Community. It seem you have tried almost everything to resolved the syncing issues between your phone and your tracker.
Make sure your mobile device is not managing multiple Bluetooth connections at the same time. You can experience interruptions with any consistently streaming Bluetooth connection such as headsets, car kits, stereo audio, tethering, and file transfers.
(Try to switch back and forth between Wi-fi and mobile data of your phone. Sometimes When I have issues to sync and do this as a workaround since my phone is not listed as compatible).
Try to restart your tracker again, repeating the process several times in a row. For more details please review this post: How to restart your Charge 2?.
If this is not working try to set up your tracker again on your existing account. You can go to this link to find more help on how to do this in different platforms.
In addition you can find all the relevant information for syncing issues in the following post: Having trouble syncing? (here's how to fix this).
Keep me posted how it goes, I'll be around!
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