HTTP Error 403 when attempting to download from learner.org

[owldown]

Checklist

• [ x] I'm reporting a broken site support
• [ x] I've verified that I'm running youtube-dl version 2021.06.06
• [ x] I've checked that all provided URLs are alive and playable in a browser
• [ x] I've checked that all URLs and arguments with special characters are properly quoted or escaped
• [ x] I've searched the bugtracker for similar issues including closed ones

Verbose log

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'https://www.learner.org/series/the-learning-classroom-theory-into-practice/learning-as-we-grow-development-and-learning/?jwsource=cl']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, pref UTF-8
[debug] youtube-dl version 2021.06.06
[debug] Python version 3.9.6 (CPython) - macOS-11.5-x86_64-i386-64bit
[debug] exe versions: ffmpeg 4.4, ffprobe 4.4, rtmpdump 2.4
[debug] Proxy map: {}
[generic] ?jwsource=cl: Requesting header
WARNING: Falling back on generic information extractor.
[generic] ?jwsource=cl: Downloading webpage
[generic] ?jwsource=cl: Extracting information
[download] Downloading playlist: Learning As We Grow: Development and Learning - Annenberg Learner
[generic] playlist Learning As We Grow: Development and Learning - Annenberg Learner: Collected 1 video ids (downloading 1 of them)
[download] Downloading video 1 of 1
[JWPlatform] lsyrIth6: Downloading JSON metadata
ERROR: Unable to download JSON metadata: HTTP Error 403: Forbidden (caused by <HTTPError 403: 'Forbidden'>); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
  File "/usr/local/Cellar/youtube-dl/2021.6.6/libexec/lib/python3.9/site-packages/youtube_dl/extractor/common.py", line 634, in _request_webpage
    return self._downloader.urlopen(url_or_request)
  File "/usr/local/Cellar/youtube-dl/2021.6.6/libexec/lib/python3.9/site-packages/youtube_dl/YoutubeDL.py", line 2288, in urlopen
    return self._opener.open(req, timeout=self._socket_timeout)
  File "/usr/local/Cellar/python@3.9/3.9.6/Frameworks/Python.framework/Versions/3.9/lib/python3.9/urllib/request.py", line 523, in open
    response = meth(req, response)
  File "/usr/local/Cellar/python@3.9/3.9.6/Frameworks/Python.framework/Versions/3.9/lib/python3.9/urllib/request.py", line 632, in http_response
    response = self.parent.error(
  File "/usr/local/Cellar/python@3.9/3.9.6/Frameworks/Python.framework/Versions/3.9/lib/python3.9/urllib/request.py", line 561, in error
    return self._call_chain(*args)
  File "/usr/local/Cellar/python@3.9/3.9.6/Frameworks/Python.framework/Versions/3.9/lib/python3.9/urllib/request.py", line 494, in _call_chain
    result = func(*args)
  File "/usr/local/Cellar/python@3.9/3.9.6/Frameworks/Python.framework/Versions/3.9/lib/python3.9/urllib/request.py", line 641, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)

Description

video plays in browser, but I'm unable to download. I've used YouTube-dl many times in the past, but not on this particular site.

[dirkf]

Still failing.