If you're the owner of a playlist, you can set your playlist public, private, or unlisted on YouTube. In contrast to a private playlist, anyone with a link to an unlisted playlist can see and share such a playlists. Videos of unlisted playlists do not show up on YouTube search.
RecoverMy.Video APP is not able to track your private playlists but your unlisted playlists. So this is kind of a workaround.
FAQ:
• How to change the privacy setting of a playlist from "private" to "unlisted"
Decide on a search criteria to find an unlisted YouTube playlist:
https://www.youtube.com/playlist?list=PLsB53Uoc-Ghg1cMQXaSLzY4i9jYPFEpU5
PLsB53Uoc-Ghg1cMQXaSLzY4i9jYPFEpU5