To fix the VLC 401 Unauthorized (200) error, ensure that you are properly connected to the source of the subtitles. Here are the steps you must take: ...

The error “401. That’s an error. Error: disabled_client. The OAuth client was disabled” seems to start occurring a few days ago.

Therefore, if you use an "ErrorDocument 401" directive then it must refer to a local document."<BR><BR>Which seems to describe the problem I'm having.

Getting the VLsub VLC error code 401 Unauthorized 200 when searching or downloading subtitles, use the method in this post to fix the issue.