If you notice that member progress is not tracking for one of your members, it could be that they are viewing the video from a mobile device. Video progress is not compatible with mobile devices at this time.
Help us to gauge the demand by sending a feature request to our ideas page. We actually use our Kajabi Ideas page to track all feature requests and make sure they get in front of our Dev team: http://ideas.newkajabi.com/
If we're able to add the feature or if we have more questions about it, we'll reach out to you and let you know.