Sorry Neon Flats is not a segment in Zwift. There are only a few circuits that are timed segments, like Volcano Circuit. Eric of Zwift Insider adds many Strava segments that are not segments in Zwift, so you will see them there but not in Zwift. In ZwiftPower you can look at the Segments menu for a list of what’s available.
Prior discussion on this topic which has been brought up many times: