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It might be that your Moto is not fully supported by fitbit. You can check the list of supported devices at www.fitbit.com/devices
If it was working ok but syncing has stopped for some reason then 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 your phone is on the supported list and those troubleshooting steps haven't helped then it's probably best to contact customer support: contact.fitbit.com
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Fitbit Product Experts Alumni are retired members of the Fitbit Product Expert Program. Learn more
I've already suggested all the troubleshooting ideas I know of. If they haven't helped and you get no further suggestions from others then contacting customer support is still your best bet.