Hello @NiccyL
Sorry to see that you are having problems syncing your Charge 6 with the Fitbit app on your phone.
This help page has the recommended troubleshooting steps to try: Why won't my Fitbit sync?
Although it's not mentioned as a troubleshooting step, some users have shared that they need to turn Wi-Fi off then on again on their phone to get their Fitbit to sync.
Hopefully, these troubleshooting steps will work for you.
Rieko | N California USA MBG PE
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