Repository: yt-dlp
Issue: `--ap-mso DTV` Broken: Unable to extract post url
Labels: account-needed,geo-blocked,site-bug,can-share-account

### Checklist

- [X] I'm reporting a broken site
- [X] I've verified that I'm running yt-dlp version **2021.12.27**. ([update instructions](https://github.com/yt-dlp/yt-dlp#update))
- [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](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)
- [ ] 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

USA

### Description

TBS and TNTDrama live stream links no longer work. This appears to also be an issue for downloading on-demand content too.

### Verbose log

```shell
[debug] Command-line config: ['--ap-mso', 'DTV', '--ap-username', 'PRIVATE', '--ap-password', 'PRIVATE', '--verbose', 'https://www.tbs.com/watchtbs/east']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, err utf-8, pref UTF-8
[debug] yt-dlp version 2021.12.27 [6223f67a8]
[debug] Python version 3.9.9 (CPython 64bit) - macOS-12.1-arm64-arm-64bit
[debug] exe versions: ffmpeg 4.4.1 (setts), ffprobe 4.4.1
[debug] Optional libraries: sqlite
[debug] Proxy map: {}
[debug] [TBS] Extracting URL: https://www.tbs.com/watchtbs/east
[TBS] east: Downloading webpage
[TBS] tbs-east: Downloading JSON metadata
[TBS] tbs-east: Downloading Provider Redirect Page
[TBS] tbs-east: Downloading Provider Login Page
ERROR: [TBS] east: Unable to extract post url; please report this issue on  https://github.com/yt-dlp/yt-dlp . Make sure you are using the latest version; see  https://github.com/yt-dlp/yt-dlp  on how to update. Be sure to call yt-dlp with the --verbose flag and include its complete output.; please report this issue on  https://github.com/yt-dlp/yt-dlp . Make sure you are using the latest version; see  https://github.com/yt-dlp/yt-dlp  on how to update. Be sure to call yt-dlp with the --verbose flag and include its complete output.
  File "/opt/homebrew/Cellar/yt-dlp/2021.12.27/libexec/lib/python3.9/site-packages/yt_dlp/extractor/common.py", line 599, in extract
    ie_result = self._real_extract(url)
  File "/opt/homebrew/Cellar/yt-dlp/2021.12.27/libexec/lib/python3.9/site-packages/yt_dlp/extractor/tbs.py", line 56, in _real_extract
    info = self._extract_ngtv_info(
  File "/opt/homebrew/Cellar/yt-dlp/2021.12.27/libexec/lib/python3.9/site-packages/yt_dlp/extractor/turner.py", line 237, in _extract_ngtv_info
    m3u8_url = self._add_akamai_spe_token(
  File "/opt/homebrew/Cellar/yt-dlp/2021.12.27/libexec/lib/python3.9/site-packages/yt_dlp/extractor/turner.py", line 41, in _add_akamai_spe_token
    query['accessToken'] = self._extract_mvpd_auth(ap_data['url'], content_id, ap_data['site_name'], ap_data['site_name'])
  File "/opt/homebrew/Cellar/yt-dlp/2021.12.27/libexec/lib/python3.9/site-packages/yt_dlp/extractor/adobepass.py", line 1657, in _extract_mvpd_auth
    mvpd_confirm_page_res = post_form(provider_login_page_res, 'Logging in', form_data)
  File "/opt/homebrew/Cellar/yt-dlp/2021.12.27/libexec/lib/python3.9/site-packages/yt_dlp/extractor/adobepass.py", line 1391, in post_form
    post_url = self._html_search_regex(r'<form[^>]+action=(["\'])(?P<url>.+?)\1', form_page, 'post url', group='url')
  File "/opt/homebrew/Cellar/yt-dlp/2021.12.27/libexec/lib/python3.9/site-packages/yt_dlp/extractor/common.py", line 1182, in _html_search_regex
    res = self._search_regex(pattern, string, name, default, fatal, flags, group)
  File "/opt/homebrew/Cellar/yt-dlp/2021.12.27/libexec/lib/python3.9/site-packages/yt_dlp/extractor/common.py", line 1173, in _search_regex
    raise RegexNotFoundError('Unable to extract %s' % _name)


[debug] Command-line config: ['--ap-mso', 'DTV', '--ap-username', 'PRIVATE', '--ap-password', 'PRIVATE', '--verbose', 'https://www.tntdrama.com/watchtnt/east']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, err utf-8, pref UTF-8
[debug] yt-dlp version 2021.12.27 [6223f67a8]
[debug] Python version 3.9.9 (CPython 64bit) - macOS-12.1-arm64-arm-64bit
[debug] exe versions: ffmpeg 4.4.1 (setts), ffprobe 4.4.1
[debug] Optional libraries: sqlite
[debug] Proxy map: {}
[debug] [TBS] Extracting URL: https://www.tntdrama.com/watchtnt/east
[TBS] east: Downloading webpage
[TBS] tnt-east: Downloading JSON metadata
[TBS] tnt-east: Downloading Provider Redirect Page
[TBS] tnt-east: Downloading Provider Login Page
ERROR: [TBS] east: Unable to extract post url; please report this issue on  https://github.com/yt-dlp/yt-dlp . Make sure you are using the latest version; see  https://github.com/yt-dlp/yt-dlp  on how to update. Be sure to call yt-dlp with the --verbose flag and include its complete output.; please report this issue on  https://github.com/yt-dlp/yt-dlp . Make sure you are using the latest version; see  https://github.com/yt-dlp/yt-dlp  on how to update. Be sure to call yt-dlp with the --verbose flag and include its complete output.
  File "/opt/homebrew/Cellar/yt-dlp/2021.12.27/libexec/lib/python3.9/site-packages/yt_dlp/extractor/common.py", line 599, in extract
    ie_result = self._real_extract(url)
  File "/opt/homebrew/Cellar/yt-dlp/2021.12.27/libexec/lib/python3.9/site-packages/yt_dlp/extractor/tbs.py", line 56, in _real_extract
    info = self._extract_ngtv_info(
  File "/opt/homebrew/Cellar/yt-dlp/2021.12.27/libexec/lib/python3.9/site-packages/yt_dlp/extractor/turner.py", line 237, in _extract_ngtv_info
    m3u8_url = self._add_akamai_spe_token(
  File "/opt/homebrew/Cellar/yt-dlp/2021.12.27/libexec/lib/python3.9/site-packages/yt_dlp/extractor/turner.py", line 41, in _add_akamai_spe_token
    query['accessToken'] = self._extract_mvpd_auth(ap_data['url'], content_id, ap_data['site_name'], ap_data['site_name'])
  File "/opt/homebrew/Cellar/yt-dlp/2021.12.27/libexec/lib/python3.9/site-packages/yt_dlp/extractor/adobepass.py", line 1657, in _extract_mvpd_auth
    mvpd_confirm_page_res = post_form(provider_login_page_res, 'Logging in', form_data)
  File "/opt/homebrew/Cellar/yt-dlp/2021.12.27/libexec/lib/python3.9/site-packages/yt_dlp/extractor/adobepass.py", line 1391, in post_form
    post_url = self._html_search_regex(r'<form[^>]+action=(["\'])(?P<url>.+?)\1', form_page, 'post url', group='url')
  File "/opt/homebrew/Cellar/yt-dlp/2021.12.27/libexec/lib/python3.9/site-packages/yt_dlp/extractor/common.py", line 1182, in _html_search_regex
    res = self._search_regex(pattern, string, name, default, fatal, flags, group)
  File "/opt/homebrew/Cellar/yt-dlp/2021.12.27/libexec/lib/python3.9/site-packages/yt_dlp/extractor/common.py", line 1173, in _search_regex
    raise RegexNotFoundError('Unable to extract %s' % _name)
```