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[YouTube] Unable to download age-restricted video

See original GitHub issue

Checklist

I’m reporting a broken site
I’ve verified that I’m running yt-dlp version 2022.03.08.1. (update instructions)
I’ve checked that all provided URLs are alive and playable in a browser
I’ve checked that all URLs and arguments with special characters are properly quoted or escaped
I’ve searched the bugtracker for similar issues including closed ones. DO NOT post duplicates
I’ve read the guidelines for opening an issue
I’ve read about sharing account credentials and I’m willing to share it if required

Region

Any region.

Description

The following age-restricted video cannot be downloaded: EuQLMXyGQOE. Cookies are provided for Firefox. I am properly logged into my YT account in Firefox and can play the video. It was working few days ago, but stopped working today.

Verbose log

[debug] Command-line config: ['-vU', '--no-cache-dir', '--ffmpeg-location', 'C:/Other/ffmpeg.exe', '--retries', 'infinite', '--fragment-retries', 'infinite', '--cookies', 'firefox', 'https://www.youtube.com/watch?v=EuQLMXyGQOE']
[debug] Encodings: locale cp65001, fs utf-8, out utf-8, err utf-8, pref cp65001
[debug] yt-dlp version 2022.03.08.1 [c0c2c57] (win_exe)
[debug] Python version 3.8.10 (CPython 64bit) - Windows-10-10.0.19043-SP0
[debug] exe versions: ffmpeg 4.4-full_build (setts), ffprobe 4.4-full_build
[debug] Optional libraries: brotli, Cryptodome, mutagen, sqlite, websockets
[debug] Proxy map: {}
Latest version: 2022.03.08.1, Current version: 2022.03.08.1
yt-dlp is up to date (2022.03.08.1)
[debug] [youtube] Extracting URL: https://www.youtube.com/watch?v=EuQLMXyGQOE
[youtube] EuQLMXyGQOE: Downloading webpage
[youtube] EuQLMXyGQOE: Downloading android player API JSON
[youtube] EuQLMXyGQOE: Downloading android agegate player API JSON
[youtube] EuQLMXyGQOE: Downloading web agegate player API JSON
ERROR: [youtube] EuQLMXyGQOE: Sign in to confirm your age. This video may be inappropriate for some users.
  File "yt_dlp\extractor\common.py", line 617, in extract
  File "yt_dlp\extractor\youtube.py", line 3339, in _real_extract
  File "yt_dlp\extractor\common.py", line 1126, in raise_no_formats