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Your fitbit can store steps for several days between syncs so your steps haven't been lost. It might be better to sort the syncing out rather than manually logging steps.
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:
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