how to get captions of unlisted youtube video

I am trying to get the caption of the youtube video which is unlisted. The video have auto Generated captions and I want that captions programmatically using nodejs.the Things that i tried are Youtube data API - > the problems is always throws the error for the not founding the video. However when I try to list it it says the video is there, so ver skeptical about it.

async function getCaptions(videoId) {  try {    // List caption tracks for the given video ID    const response = await youtube.captions.list({      part: 'snippet',      videoId: videoId,    });    const captions = response.data.items;    if (!captions.length) {      console.log('No captions found for this video.');      return;    }    // Download the caption track (e.g., the first one)    const captionId = captions[0].id;    const captionTrack = await youtube.captions.download({      id: captionId,      tfmt: 'srt', // Use 'vtt' for WebVTT format or 'srt' for SubRip    });    console.log('Caption track:', captionTrack.data);  } catch (error) {    console.error('Error fetching captions:', error);  }}getCaptions('video_id');//when I run this i get the error 404 vide not foundasync function checkVideoAccess(videoId) {  try {    const response = await youtube.videos.list({      part: 'snippet',      id: videoId,    });    if (response.data.items.length === 0) {      console.log('Video not found or inaccessible.');    } else {      console.log('Video is accessible:', response.data.items[0].snippet.title);    }  } catch (error) {    console.error('Error accessing video:', error);  }}checkVideoAccess('video_id');//when I run this i get video is accessible

I also tried scrapers-> the problem with scrapers is that the i do get the captions in my local env. but the moment i deploy it the aws ec2 instance, it stops working. I guess youtube is blocking the IP for my aws instance.

I have tried Youtube data api and scrapers and nothing is working for me. I would really appreciate any help. Also thoreo AI (website to summarize the youtube videos) is able to do generate the transcript for the unlisted youtube video. I dont know how they did that.