@valienated
Same Problem.
some tech specs of the browser,
Version - Developer version - 96.0.4691.0
Default Theme - Dark
Default search engine - duckduckgo
in Settings - Block all adverts and trackers
till yesterday all youtube videos were running properly, but now the video refuses to come, though preview can be seen.
and even after many time granting the permission to sync, it still keep giving the notice.
Tired and exasperated, feel like shifting to chrome in incognito mode, can this be resolved soon.