#17647 [YouTube] 403 error even with deno

Checklist

I've read the NO AI / NO LLM POLICY and understand I may be blocked from the repository if it is violated
I'm reporting that yt-dlp is broken on a supported site
I've verified that I have updated yt-dlp to nightly or master (update instructions)
I've checked that all provided URLs are playable in a browser with the same IP and same login details
I've checked that all URLs and arguments with special characters are properly quoted or escaped
I've searched known issues, the FAQ, and the bugtracker for similar issues including closed ones. DO NOT post duplicates
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Provide a description that is worded well enough to be understood

[email protected] deno and ffmpeg installed Trying to download a Z3Cubing video called "I built a Solar-Powered Rubik's Cube."

Provide verbose output that clearly demonstrates the problem

Run your yt-dlp command with -vU flag added (yt-dlp -vU <your command line>)
If using API, add 'verbose': True to YoutubeDL params instead
Copy the WHOLE output (starting with [debug] Command-line config) and insert it below

Complete Verbose Output

./yt-dlp.exe --cookies-from-browser firefox -vU https://www.youtube.com/watch?v=0MizhtCrHQ0

[debug] Command-line config: ['--cookies-from-browser', 'firefox', '-vU', 'https://www.youtube.com/watch?v=0MizhtCrHQ0']
[debug] Encodings: locale cp1252, fs utf-8, pref cp1252, out utf-8, error utf-8, screen utf-8
[debug] yt-dlp version [email protected] from yt-dlp/yt-dlp [594bd50c2] (win_exe)
[debug] Python 3.10.11 (CPython AMD64 64bit) - Windows-10-10.0.26200-SP0 (OpenSSL 1.1.1t  7 Feb 2023)
[debug] exe versions: ffmpeg N-126435-gf93cd72dde-20260906 (setts), ffprobe N-126435-gf93cd72dde-20260906
[debug] Optional libraries: Cryptodome-3.23.0, brotli-1.2.0, certifi-2026.07.22, curl_cffi-0.16.0, mutagen-1.48.1, requests-2.34.2, sqlite3-3.40.1, urllib3-2.7.0, websockets-16.1.1, yt_dlp_ejs-0.8.0
[debug] JS runtimes: deno-2.9.6
[debug] Proxy map: {}
Extracting cookies from firefox
[debug] Extracting cookies from: "C:\Users\burge\AppData\Roaming\Mozilla\Firefox\Profiles\\\xtlenso6.default-release\cookies.sqlite"
[debug] Firefox cookies database version: 17
Extracted 344 cookies from firefox
[debug] Request Handlers: urllib, requests, websockets, curl_cffi
[debug] Plugin directories: none
[debug] Loaded 1744 extractors
[debug] Fetching release info: https://api.github.com/repos/yt-dlp/yt-dlp/releases/latest
Latest version: [email protected] from yt-dlp/yt-dlp
yt-dlp is up to date ([email protected] from yt-dlp/yt-dlp)
[debug] [youtube] Found YouTube account cookies
[debug] [youtube] [pot] PO Token Providers: none
[debug] [youtube] [pot] PO Token Cache Providers: memory
[debug] [youtube] [pot] PO Token Cache Spec Providers: webpo
[debug] [youtube] [jsc] JS Challenge Providers: bun (unavailable), deno, node (unavailable), quickjs (unavailable)
[youtube] Extracting URL: https://www.youtube.com/watch?v=0MizhtCrHQ0
[youtube] 0MizhtCrHQ0: Downloading webpage
[youtube] 0MizhtCrHQ0: Downloading web embedded client config
[debug] [youtube] Forcing "main" player JS variant for player f572e43c
        original url = /s/player/f572e43c/player_es6.vflset/en_US/base.js
[debug] [youtube] 0MizhtCrHQ0: Detected experiment to bind GVS PO Token to video ID for web_embedded client
[youtube] 0MizhtCrHQ0: Downloading player f572e43c-main
[youtube] 0MizhtCrHQ0: Downloading web embedded player API JSON
[debug] [youtube] 0MizhtCrHQ0: Detected a 15s ad skippable after 5s for web_embedded
[youtube] 0MizhtCrHQ0: Downloading tv downgraded player API JSON
[debug] [youtube] 0MizhtCrHQ0: tv_downgraded player response playability status: UNPLAYABLE
[debug] [youtube] 0MizhtCrHQ0: Detected a 55s ad skippable after 5s for web
[debug] [youtube] 0MizhtCrHQ0: Detected a 15s ad skippable after 5s for web
[youtube] [jsc:deno] Solving JS challenges using deno
[debug] [youtube] [jsc:deno] Using challenge solver lib script v0.8.0 (source: python package, variant: minified)
[debug] [youtube] [jsc:deno] Using challenge solver core script v0.8.0 (source: python package, variant: minified)
[debug] [youtube] [jsc:deno] Running deno: 'C:\Users\burge\.deno\bin\deno.EXE' run --ext=js --no-code-cache --no-prompt --no-remote --no-lock --node-modules-dir=none --no-config --no-npm --cached-only -
[debug] Sort order given by extractor: quality, res, fps, hdr:12, source, vcodec, channels, acodec, lang, proto
[debug] Formats sorted by: hasvid, ie_pref, quality, res, fps, hdr:12(7), source, vcodec, channels, acodec, lang, proto, size, br, asr, vext, aext, hasaud, id
[debug] Default format spec: bestvideo*+bestaudio/best
[info] 0MizhtCrHQ0: Downloading 1 format(s): 399+251-19
[debug] Invoking http downloader on "https://rr4---sn-bvvbaxivnuxqjvhj5nu-p5is.googlevideo.com/videoplayback?expire=1788847901&ei=vVKfapf0B4Hdy_sPvsqFkA0&ip=2601%3A2c3%3A897f%3A1420%3A2474%3A1bd3%3Ad230%3Ad4cf&id=o-AKyzrayQw1o__zAZb39CWN-V5jPepYpOyXnz0gU77uTR&itag=399&aitags=133%2C134%2C135%2C136%2C160%2C242%2C243%2C244%2C247%2C278%2C298%2C299%2C302%2C303%2C394%2C395%2C396%2C397%2C398%2C399&source=youtube&requiressl=yes&xpc=EgVo2aDSNQ%3D%3D&met=1788826301%2C&mh=An&mm=31%2C29&mn=sn-bvvbaxivnuxqjvhj5nu-p5is%2Csn-q4fzenek&ms=au%2Crdu&mv=m&mvi=4&pl=34&rms=au%2Cau&initcwndbps=4206250&siu=1&bui=AR3QkAlVuVC8NeYORtEjgHKVaI7sZz1mlasyJMO82b2DXLHdY-KvwzYhNUtAATNWHdBQ0b9rPg&spc=I-rgIQQ3JSBLnhAVIvuit5_3lc5r1FNpyWopfCbMEwJiZnp5UpAzq8rFXizMzeO3OWZQuGohRkfc5E3FkGeULVN7UrQ&vprv=1&svpuc=1&mime=video%2Fmp4&ns=I-7TC88oIthobwlkbCmVIjIY&rqh=1&gir=yes&clen=142830826&dur=847.413&lmt=1782539150179417&mt=1788825901&fvip=5&keepalive=yes&fexp=51565116%2C52135441%2C52183203%2C52189887&c=WEB_EMBEDDED_PLAYER&sefc=1&txp=443G534&n=qwa5mBkIvFjOVg&sparams=expire%2Cei%2Cip%2Cid%2Caitags%2Csource%2Crequiressl%2Cxpc%2Csiu%2Cbui%2Cspc%2Cvprv%2Csvpuc%2Cmime%2Cns%2Crqh%2Cgir%2Cclen%2Cdur%2Clmt&sig=AE0s2JYwRAIgGCzuvvUFSecCzoD_AzH7G44tiVN-NfMR8bWBqqa77FkCICipGHFw-HAwWNMQL_Dn4cjhghDjincz-vPL3FnrKwHl&lsparams=met%2Cmh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Crms%2Cinitcwndbps&lsig=APaTxxMwRgIhALhh03y56Xm4O5uogEUCZE35eQbxRKxdEupHZ1T7TL33AiEA8dnkao9mnXi_Sx6lR6aLj2-r9jYSoNP4lxh2wfyvPFI%3D"
[download] Sleeping 4.00 seconds as required by the site...
ERROR: unable to download video data: HTTP Error 403: Forbidden
Traceback (most recent call last):
  File "yt_dlp\YoutubeDL.py", line 3570, in process_info
  File "yt_dlp\YoutubeDL.py", line 3323, in dl
  File "yt_dlp\downloader\common.py", line 480, in download
  File "yt_dlp\downloader\http.py", line 362, in real_download
  File "yt_dlp\downloader\http.py", line 119, in establish_connection
  File "yt_dlp\YoutubeDL.py", line 4304, in urlopen
  File "yt_dlp\networking\common.py", line 117, in send
  File "yt_dlp\networking\_helper.py", line 194, in wrapper
  File "yt_dlp\networking\common.py", line 359, in send
  File "yt_dlp\networking\_requests.py", line 361, in _send
yt_dlp.networking.exceptions.HTTPError: HTTP Error 403: Forbidden