Have you reset the bulbs? I had this issue, and didn't know how to reset the bulbs, but this is the official documentation.
Note: If the light bulb does not flash, you may need to reset it. Turn off the light
and wait 3 seconds. Turn on the light and wait 3 seconds. Repeat turning the
light off and on (approximately 5 times) until the bulb flashes once. As soon as it
flashes once, it is reset. If the bulb does not flash or the Wink app does not display
success, contact Wink Support at 1 (844) WINKAPP or support@winkapp.com.