Youtube: Unable to log in: HTTP Error 400: Bad Request

[marcello-pietrobon]

Checklist

• I'm reporting a broken site support issue
• I've verified that I'm running youtube-dl version 2020.06.16.1
• 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 bug reports including closed ones
• I've read bugs section in FAQ

Verbose log

PASTE VERBOSE LOG HERE
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, pref UTF-8
[debug] youtube-dl version 2020.06.16.1
[debug] Python version 3.8.2 (CPython) - Linux-5.4.0-37-generic-x86_64-with-glibc2.29
[debug] exe versions: ffmpeg 4.2.2, ffprobe 4.2.2
[debug] Proxy map: {}
[youtube] Downloading login page
[youtube] Looking up account info
[youtube] Logging in
WARNING: Unable to log in: HTTP Error 400: Bad Request

urls = ['https://www.youtube.com/watch?v=nwFloCPXzCs']
ydl_opts['usenetrc'] = True

## Description
the problem is pretty downward the login execution, where
youtube_dl/extractor/youtube.py line 172

challenge_results = req(
            self._CHALLENGE_URL, challenge_req,
            'Logging in', 'Unable to log in')
returns False

I'm logging in on my own account, so it's expected to work.
I have friend in a different country who reported to me the same problem.

If you give some hints on how to find out the correct way to login
 where this code may be broken I might fix it.

P.S. with almost 3000 open issues, I lost a bit of time trying to find out
 whether this issue was already reported or not. There should be a search
 engine for this, but I guess this is a github problem, I just don't know.

[marcello-pietrobon]

Apologies but I have no idea of what is the issue number that I'm duplicating
Is it possible to have the link or the number so I can find more info about it and maybe fix it?

[marcello-pietrobon]

Ah, ok, finally found
#23860
and here precisely describes MatrixView what to do:
#21313 (comment)

dsftw, what about maybe pinning this issue? loads of people seem to have it.
thanks though, for the work you do. Great job.