I'm not even certain how to phrase this as a simple question, so I'll just describe what's happening for me.
I use the same email account to log into YouTube on both my browser (Brave) and my Roku device.
The recommendations, history, favorites, playlists, etc., are completely different on the two devices. In my case, the Roku recommends history, documentaries, etc. But when I'm using my PC, with the Brave browser, I get my preferred music and news recommendations.
Is there a way to synch my Roku to my browser?
Also, my phone does seem to be synched to my PC browser with YouTube.