Prior to Android 6.0, clicking a link often triggered a "Complete action using" dialogue box. Marshmallow sought to eliminate this friction by allowing apps to "claim" specific web domains. However, because is a third-party redirect service and not a YouTube-owned domain, Android 6 often fails to recognize that a bit.ly link is actually a "supported link" for the YouTube app. 2. Troubleshooting Redirection Issues
Since the official YouTube app is dead on Android 6, install (an open-source YouTube frontend). bit.ly youtube android 6