### Checklist
- [x] I'm reporting that yt-dlp is broken on a **supported** site…
- [x] I've verified that I have **updated yt-dlp to nightly or master** ([update instructions](https://github.com/yt-dlp/yt-dlp#update-channels))
- [x] I've checked that all provided URLs are playable in a browser with the same IP and same login details
- [x] I've checked that all URLs and arguments with special characters are [properly quoted or escaped](https://github.com/yt-dlp/yt-dlp/wiki/FAQ#video-url-contains-an-ampersand--and-im-getting-some-strange-output-1-2839-or-v-is-not-recognized-as-an-internal-or-external-command)
- [x] I've searched [known issues](https://github.com/yt-dlp/yt-dlp/issues/3766), [the FAQ](https://github.com/yt-dlp/yt-dlp/wiki/FAQ), and the [bugtracker](https://github.com/yt-dlp/yt-dlp/issues?q=is%3Aissue%20-label%3Aspam%20%20) for similar issues **including closed ones**. DO NOT post duplicates
- [x] I've read the [policy against AI/LLM contributions](https://github.com/yt-dlp/yt-dlp/blob/master/CONTRIBUTING.md#automated-contributions-ai--llm-policy) and understand I may be blocked from the repository if it is violated
- [x] I've read about [sharing account credentials](https://github.com/yt-dlp/yt-dlp/blob/master/CONTRIBUTING.md#are-you-willing-to-share-account-details-if-needed) and I'm willing to share it if required
### Region
United States
### Provide a description that is worded well enough to be understood
I'm downloading playlists using the mweb client + bgutil po-token generator and am now getting 403 forbidden errors after the signature extraction bug was fixed.
### Provide verbose output that clearly demonstrates the problem
- [x] 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
- [x] Copy the WHOLE output (starting with `[debug] Command-line config`) and insert it below
### Complete Verbose Output
```shell
[debug] Command-line config: ['-vU', '--download-archive', '../.ytdlp-archive', '--cache-dir', '../.ytdlp-cache', '--cookies-from-browser', 'firefox:~/.firejail/ytdlp-firefox/.mozilla/firefox', '--write-subs', '--write-auto-subs', '--sub-langs', 'en', '--mark-watched', '--write-thumbnail', '--no-overwrites', '--sponsorblock-mark', 'all', '--embed-chapters', '--extractor-args', 'youtube:player-client=mweb', '--mtime', '--write-description', '-f', 'bestvideo+bestaudio', '--limit-rate', '1M', '--skip-playlist-after-errors', '5', '--sleep-subtitles', '5', '--sleep-requests', '1', '--sleep-interval', '10', '--max-sleep-interval', '30', 'https://www.youtube.com/playlist?list=PL2Gu7oWr7L6It0sJqZLLzd4o0XzLUTyXj']
[debug] Encodings: locale UTF-8, fs utf-8, pref UTF-8, out utf-8, error utf-8, screen utf-8
[debug] yt-dlp version master@2025.09.23.063346 from yt-dlp/yt-dlp-master-builds [2e81e298c] (zip)
[debug] Python 3.10.12 (CPython x86_64 64bit) - Linux-6.14.0-061400-generic-x86_64-with-glibc2.35 (OpenSSL 3.0.2 15 Mar 2022, glibc 2.35)
[debug] exe versions: ffmpeg 4.4.2 (setts), ffprobe 4.4.2, rtmpdump 2.4
[debug] Optional libraries: Cryptodome-3.23.0, brotli-1.1.0, certifi-2025.08.03, curl_cffi-0.13.0, mutagen-1.47.0, pyxattr-0.7.2, requests-2.32.5, secretstorage-3.3.1, sqlite3-3.37.2, urllib3-2.5.0, websockets-15.0.1
[debug] Proxy map: {}
Extracting cookies from firefox
[debug] Extracting cookies from: "[home]/.firejail/ytdlp-firefox/.mozilla/firefox/pqivivqo.default-release/cookies.sqlite"
Extracted 76 cookies from firefox
[debug] Request Handlers: urllib, requests, websockets, curl_cffi
[debug] Plugin directories: [home]/.local/lib/python3.10/site-packages/yt_dlp_plugins
[debug] Loaded 1833 extractors
[debug] Loading archive file '../.ytdlp-archive'
[debug] Fetching release info: https://api.github.com/repos/yt-dlp/yt-dlp-master-builds/releases/latest
Latest version: master@2025.09.23.063346 from yt-dlp/yt-dlp-master-builds
yt-dlp is up to date (master@2025.09.23.063346 from yt-dlp/yt-dlp-master-builds)
[debug] [youtube:tab] Found YouTube account cookies
[youtube:tab] Extracting URL: https://www.youtube.com/playlist?list=PL2Gu7oWr7L6It0sJqZLLzd4o0XzLUTyXj
[youtube:tab] PL2Gu7oWr7L6It0sJqZLLzd4o0XzLUTyXj: Downloading webpage
[youtube:tab] Sleeping 1.0 seconds ...
[youtube:tab] PL2Gu7oWr7L6It0sJqZLLzd4o0XzLUTyXj: Redownloading playlist API JSON with unavailable videos
[download] Downloading playlist: AjaxASMR
[youtube:tab] Sleeping 1.0 seconds ...
[youtube:tab] PL2Gu7oWr7L6It0sJqZLLzd4o0XzLUTyXj page 1: Downloading API JSON
[info] Writing playlist description to: AjaxASMR [PL2Gu7oWr7L6It0sJqZLLzd4o0XzLUTyXj].description
[info] Downloading playlist thumbnail 3 ...
[info] Writing playlist thumbnail 3 to: AjaxASMR [PL2Gu7oWr7L6It0sJqZLLzd4o0XzLUTyXj].jpg
[youtube:tab] Playlist AjaxASMR: Downloading 43 items of 43
[download] Downloading item 1 of 43
[debug] [youtube] Found YouTube account cookies
[debug] [youtube] [pot:bgutil:script] No script path passed, defaulting to [home]/bgutil-ytdlp-pot-provider/server/build/generate_once.js
[debug] [youtube] [pot] PO Token Providers: bgutil:http-1.2.2 (external), bgutil:script-1.2.2 (external)
[debug] [youtube] [pot] PO Token Cache Providers: memory
[debug] [youtube] [pot] PO Token Cache Spec Providers: webpo
[youtube] Extracting URL: https://www.youtube.com/watch?v=hVZZzV7RhkM
[youtube] Sleeping 1.0 seconds ...
[youtube] hVZZzV7RhkM: Downloading webpage
[youtube] Sleeping 1.0 seconds ...
[youtube] hVZZzV7RhkM: Downloading mweb client config
[debug] [youtube] Forcing "main" player JS variant for player 0004de42
original url = /s/player/377ca75b/player_ias.vflset/en_US/base.js
[youtube] Sleeping 1.0 seconds ...
[youtube] hVZZzV7RhkM: Downloading mweb player API JSON
[youtube] Sleeping 1.0 seconds ...
[youtube] hVZZzV7RhkM: Downloading player 0004de42-main
[debug] [youtube] Decrypted nsig RvpHkamMnJ7oLdI => C1nfX_ST0Qbavg
[debug] Saving youtube-nsig.0004de42-main to cache
[debug] [youtube] [pot:bgutil:http] No base_url provided, defaulting to http://127.0.0.1:4416
[youtube] [pot:bgutil:http] Generating a gvs PO Token for mweb client via bgutil HTTP server
[debug] [youtube] hVZZzV7RhkM: Retrieved a gvs PO Token for mweb client
[debug] [youtube] Decrypted nsig QnwDULvRrA6WtJH => XQY7v9Oh5hDKdg
[youtube] Sleeping 1.0 seconds ...
[youtube] hVZZzV7RhkM: Marking watched
[youtube] Sleeping 1.0 seconds ...
[youtube] hVZZzV7RhkM: Marking fully watched
[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
[SponsorBlock] Fetching SponsorBlock segments
[debug] SponsorBlock query: https://sponsor.ajay.app/api/skipSegments/7f2d?service=YouTube&categories=%5B%22music_offtopic%22%2C+%22filler%22%2C+%22selfpromo%22%2C+%22intro%22%2C+%22interaction%22%2C+%22poi_highlight%22%2C+%22chapter%22%2C+%22preview%22%2C+%22outro%22%2C+%22sponsor%22%5D&actionTypes=%5B%22skip%22%2C+%22poi%22%2C+%22chapter%22%5D
[SponsorBlock] No matching segments were found in the SponsorBlock database
[info] hVZZzV7RhkM: Downloading 1 format(s): 398+251
[info] Writing video description to: [M4A ASMR] My Eepy Puppy~ [Affirmation || Good Puppy || Fireplace || Kisses || Ear Rubs] [hVZZzV7RhkM].description
[info] There are no subtitles for the requested languages
[info] Downloading video thumbnail 41 ...
[info] Video Thumbnail 41 does not exist
[info] Downloading video thumbnail 40 ...
[info] Video Thumbnail 40 does not exist
[info] Downloading video thumbnail 39 ...
[info] Video Thumbnail 39 does not exist
[info] Downloading video thumbnail 38 ...
[info] Video Thumbnail 38 does not exist
[info] Downloading video thumbnail 37 ...
[info] Writing video thumbnail 37 to: [M4A ASMR] My Eepy Puppy~ [Affirmation || Good Puppy || Fireplace || Kisses || Ear Rubs] [hVZZzV7RhkM].webp
[debug] Invoking http downloader on "https://rr1---sn-bvvbaxivnuxqjvhj5nu-p5ie.googlevideo.com/videoplayback?expire=1758696430&[redacted]"
[download] Sleeping 14.93 seconds ...
ERROR: unable to download video data: HTTP Error 403: Forbidden
Traceback (most recent call last):
File "[home]/.local/bin/yt-dlp/yt_dlp/YoutubeDL.py", line 3467, in process_info
partial_success, real_download = self.dl(fname, new_info)
File "[home]/.local/bin/yt-dlp/yt_dlp/YoutubeDL.py", line 3227, in dl
return fd.download(name, new_info, subtitle)
File "[home]/.local/bin/yt-dlp/yt_dlp/downloader/common.py", line 479, in download
ret = self.real_download(filename, info_dict)
File "[home]/.local/bin/yt-dlp/yt_dlp/downloader/http.py", line 362, in real_download
establish_connection()
File "[home]/.local/bin/yt-dlp/yt_dlp/downloader/http.py", line 119, in establish_connection
ctx.data = self.ydl.urlopen(request)
File "[home]/.local/bin/yt-dlp/yt_dlp/YoutubeDL.py", line 4190, in urlopen
return self._request_director.send(req)
File "[home]/.local/bin/yt-dlp/yt_dlp/networking/common.py", line 117, in send
response = handler.send(request)
File "[home]/.local/bin/yt-dlp/yt_dlp/networking/_helper.py", line 194, in wrapper
return func(self, *args, **kwargs)
File "[home]/.local/bin/yt-dlp/yt_dlp/networking/common.py", line 359, in send
return self._send(request)
File "[home]/.local/bin/yt-dlp/yt_dlp/networking/_requests.py", line 357, in _send
raise HTTPError(res, redirect_loop=max_redirects_exceeded)
yt_dlp.networking.exceptions.HTTPError: HTTP Error 403: Forbidden
[download] Downloading item 2 of 43
[youtube] Extracting URL: https://www.youtube.com/watch?v=eVI3rUU9Kg4
[youtube] Sleeping 1.0 seconds ...
[youtube] eVI3rUU9Kg4: Downloading webpage
[youtube] Sleeping 1.0 seconds ...
^C
ERROR: Interrupted by user
```