Hello @Pafitzy, welcome to the Community Forums!
First, I appreciate your effort and patience for troubleshooting this situation before posting over here, I totally understand how frustrating this matter can be for you. If you haven't already done so, I recommend you to check how the syncing procedure works here and see if there's a missing requirement on your mobile device that's preventing the syncing procedure to be completed.
Then, you can move forward and try the troubleshooting steps that are specified on: Why won't my Fitbit device sync? and let me know how it goes.
Let me know if further assistance is needed and if you have any additional questions.
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