[youtube] Age-restricted videos now always require sign-in
### DO NOT REMOVE OR SKIP THE ISSUE TEMPLATE

- [X] I understand that I will be **blocked** if I *intentionally* remove or skip any mandatory\* field

### 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) and the [bugtracker](https://github.com/yt-dlp/yt-dlp/issues?q=) for similar issues **including closed ones**. DO NOT post duplicates
- [X] I've read the [guidelines for opening an issue](https://github.com/yt-dlp/yt-dlp/blob/master/CONTRIBUTING.md#opening-an-issue)
- [ ] 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

_No response_

### Provide a description that is worded well enough to be understood

I'm unable to download any age restricted videos without signing in. Wasn't a problem till a week ago.
I'm on the latest nightly and it fails with or without the AGP plugin.



### 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
C:\Users\Casey>yt-dlp https://www.youtube.com/watch?v=7Do70nztRNE -vU
[debug] Command-line config: ['https://www.youtube.com/watch?v=7Do70nztRNE', '-vU']
[debug] Encodings: locale cp1252, fs utf-8, pref cp1252, out utf-8, error utf-8, screen utf-8
[debug] yt-dlp version nightly@2024.10.19.232833 from yt-dlp/yt-dlp-nightly-builds [679c68240] (pip)
[debug] Python 3.11.2 (CPython AMD64 64bit) - Windows-10-10.0.19044-SP0 (OpenSSL 1.1.1s  1 Nov 2022)
[debug] exe versions: ffmpeg 2023-07-06-git-f00222e81f-essentials_build-www.gyan.dev (setts), ffprobe 2023-07-06-git-f00222e81f-essentials_build-www.gyan.dev
[debug] Optional libraries: Cryptodome-3.19.0, brotli-1.1.0, certifi-2022.12.07, curl_cffi-0.5.10, mutagen-1.47.0, requests-2.32.3, sqlite3-3.39.4, urllib3-1.26.18, websockets-13.1
[debug] Proxy map: {}
[debug] Request Handlers: urllib, requests, websockets, curl_cffi
[debug] Extractor Plugins: AGB (YoutubeIE)
[debug] Plugin directories: ['C:\\Users\\Casey\\AppData\\Local\\Programs\\Python\\Python311\\Lib\\site-packages\\yt_dlp_plugins']
[debug] Loaded 1838 extractors
[debug] Fetching release info: https://api.github.com/repos/yt-dlp/yt-dlp-nightly-builds/releases/latest
Latest version: nightly@2024.10.19.232833 from yt-dlp/yt-dlp-nightly-builds
yt-dlp is up to date (nightly@2024.10.19.232833 from yt-dlp/yt-dlp-nightly-builds)
[youtube+AGB] Extracting URL: https://www.youtube.com/watch?v=7Do70nztRNE
[youtube+AGB] 7Do70nztRNE: Downloading webpage
[youtube+AGB] 7Do70nztRNE: Downloading ios player API JSON
[youtube+AGB] 7Do70nztRNE: This video is age-restricted; some formats may be missing without authentication. Use --cookies-from-browser or --cookies for the authentication. See  https://github.com/yt-dlp/yt-dlp/wiki/FAQ#how-do-i-pass-cookies-to-yt-dlp  for how to manually pass cookies
[youtube+AGB] 7Do70nztRNE: Downloading tv embedded player API JSON
[youtube+AGB] 7Do70nztRNE: Downloading mweb player API JSON
[youtube+AGB] 7Do70nztRNE: Downloading Zerody API JSON
WARNING: [youtube+AGB] Unable to download JSON metadata: HTTP Error 502: Bad Gateway
ERROR: [youtube+AGB] 7Do70nztRNE: Sign in to confirm your age. This video may be inappropriate for some users.
  File "C:\Users\Casey\AppData\Local\Programs\Python\Python311\Lib\site-packages\yt_dlp\extractor\common.py", line 741, in extract
    ie_result = self._real_extract(url)
                ^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Casey\AppData\Local\Programs\Python\Python311\Lib\site-packages\yt_dlp\extractor\youtube.py", line 4468, in _real_extract
    self.raise_no_formats(reason, expected=True)
  File "C:\Users\Casey\AppData\Local\Programs\Python\Python311\Lib\site-packages\yt_dlp\extractor\common.py", line 1275, in raise_no_formats
    raise ExtractorError(msg, expected=expected, video_id=video_id)
```