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I would try restarting your phone and then restarting your fitbit using this procedure:
https://help.fitbit.com/articles/en_US/Help_article/1186/
Give this a few tries as it doesn't always work. If it still won't sync after that then there are some more ideas to try in this help file: https://help.fitbit.com/articles/en_US/Help_article/1866/
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Fitbit Product Experts Alumni are retired members of the Fitbit Product Expert Program. Learn more
If you've tried restarting your fitbit multiple times and gone through that troubleshooting guide with no success then the only option left is to contact customer support to see if they can offer any other ideas and, if not, advise on your warranty status and options: contact.fitbit.com
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