Videos embedded on other landing pages will track how much of the video is viewed, how many times, etc, but it will not track who watched the video.
If you are having issues tracking videos from video pages try sending it to yourself and then viewing on your mobile device connected to your mobile internet, instead of the same wifi as your computer.
Also make sure you are not logged into Dubb on the mobile device.
Different device and different internet connection.
Also sometimes you can just try a different browser, like Safari or Edge