Welcome on board @Abizar! Thanks for taking the time to troubleshoot this syncing issue. Also, thanks for checking the list of supported devices provided by @SunsetRunner. Nice way to go!
Please keep in mind that when a device is not supported we cannot guarantee its functionality with the Fitbit app. It might work at a certain time and then it can stop working out of nowhere after an update. This is because the app is not optimized to that device and any change could impact the performance.
Note that the devices on this list have been confirmed as fully compatible with all features of Fitbit devices and the Fitbit app. While a phone or tablet may not be verified as fully compatible, the Fitbit app may still work with your device.
Our team routinely test new devices to ensure full compatibility with Fitbit devices and the Fitbit app, and are constantly working to confirm compatibility with new phone models. Be sure to verify that your phone meets the minimum operating system requirements. Also, it would be great if you take a look at the article: Why won't my Fitbit device sync?
Let me know if there's anything else I may assist you with.
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