Repository: yt-dlp
Issue: HTTP Error 400 on teachable account page
Labels: account-needed,site-bug,can-share-account

### Checklist

- [X] I'm reporting a bug unrelated to a specific site
- [X] I've verified that I'm running yt-dlp version **2022.05.18** ([update instructions](https://github.com/yt-dlp/yt-dlp#update)) or later (specify commit)
- [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/ytdl-org/youtube-dl#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 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)

### Description

Site apparently changed and no longer hosting on wistia, download options no longer working.


### Verbose log

```shell
yt-dlp --username xxx --password yyy --cookies-from-browser chrome --verbose https://courses.davemorrowphotography.com/courses/1375185/lectures/38957579
[debug] Command-line config: ['--username', 'PRIVATE', '--password', 'PRIVATE', '--cookies-from-browser', 'chrome', '--verbose', 'https://courses.davemorrowphotography.com/courses/1375185/lectures/38957579']
[debug] Encodings: locale cp1252, fs utf-8, pref cp1252, out utf-8, error utf-8, screen utf-8
[debug] yt-dlp version 2022.05.18 [b14d523] (win_exe)
[debug] Python version 3.8.10 (CPython 64bit) - Windows-10-10.0.22000-SP0
[debug] Checking exe version: ffprobe -bsfs
[debug] Checking exe version: avprobe -bsfs
[debug] Checking exe version: ffmpeg -bsfs
[debug] exe versions: ffmpeg 4.2.3
[debug] Optional libraries: Cryptodome-3.14.1, brotli-1.0.9, certifi-2021.10.08, mutagen-1.45.1, sqlite3-2.6.0, websockets-10.3
[Cookies] Extracting cookies from chrome
[debug] Extracting cookies from: "C:\Users\xxx\AppData\Local\Google\Chrome\User Data\Default\Network\Cookies"
[debug] Found local state file at "C:\Users\xxx\AppData\Local\Google\Chrome\User Data\Local State"
[Cookies] Extracted 2326 cookies from chrome
[debug] cookie version breakdown: {'v10': 2326, 'other': 0, 'unencrypted': 0}
[debug] Proxy map: {}
[debug] [generic] Extracting URL: https://courses.davemorrowphotography.com/courses/1375185/lectures/38957579
[generic] 38957579: Requesting header
WARNING: [generic] Falling back on generic information extractor.
[generic] 38957579: Downloading webpage
[generic] 38957579: Extracting information
[debug] Looking for video embeds
[debug] [Teachable] Extracting URL: teachable:https://courses.davemorrowphotography.com/courses/1375185/lectures/38957579
[Teachable] Downloading courses.davemorrowphotography.com login page
[Teachable] Logging in to courses.davemorrowphotography.com
ERROR: [Teachable] 38957579: Unable to download webpage: HTTP Error 400: Bad Request (caused by <HTTPError 400: 'Bad Request'>); please report this issue on  https://github.com/yt-dlp/yt-dlp/issues?q= , filling out the appropriate issue template. Confirm you are on the latest version using  yt-dlp -U
  File "yt_dlp\extractor\common.py", line 642, in extract
  File "yt_dlp\extractor\teachable.py", line 155, in _real_extract
  File "yt_dlp\extractor\teachable.py", line 75, in _login
  File "yt_dlp\extractor\common.py", line 933, in _download_webpage
  File "yt_dlp\extractor\common.py", line 801, in _download_webpage_handle
  File "yt_dlp\extractor\common.py", line 786, in _request_webpage

  File "yt_dlp\extractor\common.py", line 768, in _request_webpage
  File "yt_dlp\YoutubeDL.py", line 3596, in urlopen
  File "urllib\request.py", line 531, in open
  File "urllib\request.py", line 640, in http_response
  File "urllib\request.py", line 569, in error
  File "urllib\request.py", line 502, in _call_chain
  File "urllib\request.py", line 649, in http_error_default
urllib.error.HTTPError: HTTP Error 400: Bad Request
```