In YouTube the dubbing Is no unchageable, because the app Is unzincronized whit the original app, (youtube) please update the browser app for the app has more usefull.
Any chance, that your issue is the same as, or similar to:
Re that issue . . .
Title translated to English:
Add audio tracks to change the dubbing on the YouTube page.
Description translated to English:
Please update the browser to add the option to change the audio track of a video with automatic dubbing that you are watching on YouTube, because:
when you want to watch a video that is dubbed into Spanish, it tells you that it is dubbed, but there is no option in the video settings (gear icon) to change the audio track.