Tele5 / Nexx is broken (403)

[ibisoda]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2020.02.16
• 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 issues including closed ones

Verbose log

$ youtube-dl -v --cookies ./cookies.txt --no-check-certificate "https://www.tele5.de/filme/the-captive-spurlos-verschwunden/"
[debug] System config: ['--prefer-free-formats']
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '--cookies', './cookies.txt', '--no-check-certificate', 'https://www.tele5.de/filme/the-captive-spurlos-verschwunden/']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2020.02.16
[debug] Python version 3.7.6 (CPython) - Linux-5.4.19-200.fc31.x86_64-x86_64-with-fedora-31-Thirty_One
[debug] exe versions: none
[debug] Proxy map: {}
[Tele5] the-captive-spurlos-verschwunden: Downloading webpage
[Nexx] 1658054: Downloading JSON metadata
[Nexx] 1658054: Downloading m3u8 information
[Nexx] 1658054: Downloading MPD manifest
[Nexx] 1658054: Downloading ISM manifest
[debug] Default format spec: best/bestvideo+bestaudio
[debug] Invoking downloader on 'http://tele5nexx.akamaized.net/35bce7ed-f64f-4f87-9a86-fd31740a5c86/1658054_src_1024x576_1500.mp4'
ERROR: unable to download video data: HTTP Error 403: Forbidden
Traceback (most recent call last):
  File "./youtube-dl/youtube_dl/YoutubeDL.py", line 1925, in process_info
    success = dl(filename, info_dict)
  File "./youtube-dl/youtube_dl/YoutubeDL.py", line 1864, in dl
    return fd.download(name, info)
  File "./youtube-dl/youtube_dl/downloader/common.py", line 366, in download
    return self.real_download(filename, info_dict)
  File "./youtube-dl/youtube_dl/downloader/http.py", line 341, in real_download
    establish_connection()
  File "./youtube-dl/youtube_dl/downloader/http.py", line 109, in establish_connection
    ctx.data = self.ydl.urlopen(request)
  File "./youtube-dl/youtube_dl/YoutubeDL.py", line 2237, in urlopen
    return self._opener.open(req, timeout=self._socket_timeout)
  File "/usr/lib64/python3.7/urllib/request.py", line 531, in open
    response = meth(req, response)
  File "/usr/lib64/python3.7/urllib/request.py", line 641, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib64/python3.7/urllib/request.py", line 569, in error
    return self._call_chain(*args)
  File "/usr/lib64/python3.7/urllib/request.py", line 503, in _call_chain
    result = func(*args)
  File "/usr/lib64/python3.7/urllib/request.py", line 649, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 403: Forbidden

Description

Using ytdl on Tele5 Videos results in 403 Error. I can play them in my browser without any problems.
from a 2019 issue, there was a suggestion, that it works if you provide the --cookies flag but that had no effect at all. Maybe the site changed again.

Website is AFAIK geo-locked to Germany.