Repository: yt-dlp
Issue: [NiconicoChannelPlus] Unable to fetch channel list: HTTP Error 400: Bad Request
Labels: site-bug,triage

### DO NOT REMOVE OR SKIP THE ISSUE TEMPLATE

- [X] I understand that I will be **blocked** if I *intentionally* remove or skip any mandatory\* field

### Checklist

- [X] I'm reporting that yt-dlp is broken on a **supported** site
- [X] I've verified that I have **updated yt-dlp to nightly or master** ([update instructions](https://github.com/yt-dlp/yt-dlp#update-channels))
- [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/yt-dlp/yt-dlp/wiki/FAQ#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 [known issues](https://github.com/yt-dlp/yt-dlp/issues/3766) and 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)
- [X] 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

Japan

### Provide a description that is worded well enough to be understood

I tried to download a video on NiconicoChannel Plus that is exclusive to channel members, but I got error 400 and could not download it.
I have looked on other forums and it seems that similar errors are often a problem with the region you are viewing. However, I live in Japan, so it is hard to believe that the region is the cause.

### Provide verbose output that clearly demonstrates the problem

- [X] Run **your** yt-dlp command with **-vU** flag added (`yt-dlp -vU <your command line>`)
- [ ] If using API, add `'verbose': True` to `YoutubeDL` params instead
- [X] Copy the WHOLE output (starting with `[debug] Command-line config`) and insert it below

### Complete Verbose Output

```shell
[debug] Command-line config: ['-vU', '--cookies', 'C:\\Users\\hidem\\Downloads\\nicochannelcookies.txt', 'https://nicochannel.jp/ihara-rikka-officialfc/video/smo4DKnipKSrBACNu6SyddMg']
[debug] Encodings: locale cp932, fs utf-8, pref cp932, out utf-8, error utf-8, screen utf-8
[debug] yt-dlp version nightly@2024.11.24.232931 from yt-dlp/yt-dlp-nightly-builds [4b5eec0aa] (win_exe)
[debug] Python 3.10.11 (CPython AMD64 64bit) - Windows-10-10.0.26100-SP0 (OpenSSL 1.1.1t  7 Feb 2023)
[debug] exe versions: ffmpeg N-113785-gfe340c3244-20240223 (setts), ffprobe N-113785-gfe340c3244-20240223
[debug] Optional libraries: Cryptodome-3.21.0, brotli-1.1.0, certifi-2024.08.30, curl_cffi-0.5.10, mutagen-1.47.0, requests-2.32.3, sqlite3-3.40.1, urllib3-2.2.3, websockets-14.1
[debug] Proxy map: {}
[debug] Request Handlers: urllib, requests, websockets, curl_cffi
[debug] Loaded 1837 extractors
[debug] Fetching release info: https://api.github.com/repos/yt-dlp/yt-dlp-nightly-builds/releases/latest
Latest version: nightly@2024.11.24.232931 from yt-dlp/yt-dlp-nightly-builds
yt-dlp is up to date (nightly@2024.11.24.232931 from yt-dlp/yt-dlp-nightly-builds)
[NiconicoChannelPlus] Extracting URL: https://nicochannel.jp/ihara-rikka-officialfc/video/smo4DKnipKSrBACNu6SyddMg
[NiconicoChannelPlus] channels/ihara-rikka-officialfc: Fetching channel list
ERROR: [NiconicoChannelPlus] Unable to fetch channel list: HTTP Error 400: Bad Request (caused by <HTTPError 400: Bad Request>)
  File "yt_dlp\extractor\common.py", line 742, in extract
  File "yt_dlp\extractor\niconicochannelplus.py", line 103, in _real_extract
  File "yt_dlp\extractor\niconicochannelplus.py", line 26, in _find_fanclub_site_id
  File "yt_dlp\extractor\niconicochannelplus.py", line 22, in _call_api
  File "yt_dlp\extractor\common.py", line 1152, in download_content
  File "yt_dlp\extractor\common.py", line 1112, in download_handle
  File "yt_dlp\extractor\common.py", line 962, in _download_webpage_handle
  File "yt_dlp\extractor\common.py", line 911, in _request_webpage

  File "yt_dlp\extractor\common.py", line 898, in _request_webpage
  File "yt_dlp\YoutubeDL.py", line 4162, in urlopen
  File "yt_dlp\networking\common.py", line 117, in send
  File "yt_dlp\networking\_helper.py", line 208, in wrapper
  File "yt_dlp\networking\common.py", line 340, in send
  File "yt_dlp\networking\_requests.py", line 365, in _send
yt_dlp.networking.exceptions.HTTPError: HTTP Error 400: Bad Request
```