There are a few reasons why you might not be seeing a successful swipe. Below are the more common reasons with solutions.
Finger is Too Cold
If your finger is too cold, sometimes the swipe will not properly register. Warm up your finger and try again.
Device Needs Charging
Do you see red "error" lights when swiping? If not, your device is out of battery and needs charging. For instructions on how to charge your Fig, please see this article.