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Hi @SharadSalve - I'm not sure if you mean that you aren't able to connect your tracker to your phone or that your tracker is not syncing. I also don't know if you've already done some troubleshooting. None-the-less, please take a look at the help articles below and let us know if you are still in need of assistance.
https://help.fitbit.com/articles/en_US/Help_article/1873