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Has it been working ok but has now stopped or has it never worked?
If it's never worked then have you followed the setup process documented here: https://help.fitbit.com/articles/en_US/Help_article/1979/
If it's just stopped working there is a troubleshooting guide here: https://help.fitbit.com/articles/en_US/Help_article/1610/
A common issue with the Charge 2 is that it can be accidentally put into "do not disturb" mode. This is turned on / off by pressing and holding the button on the fitbit.
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