Can't download subtitle

[MrRoso]

• [ x ] I'm asking a question
• [ x ] I've looked through the README and FAQ for similar questions
• [ x ] I've searched the bugtracker for similar questions including closed ones

I want to download a video with the subtitle from this side https://www.ndr.de/fernsehen/Morden-im-Norden-Zivilcourage,mordenimnorden276.html.

When i search for the subtitle format, I get follow message:
C:\Windows\system32>youtube-dl -v --list-subs https://www.ndr.de/fernsehen/Morde
n-im-Norden-Zivilcourage,mordenimnorden276.html
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '--list-subs', 'https://www.ndr.de/fernsehen/M
orden-im-Norden-Zivilcourage,mordenimnorden276.html']
[debug] Encodings: locale cp1252, fs mbcs, out cp850, pref cp1252
[debug] youtube-dl version 2020.06.16.1
[debug] Python version 3.4.4 (CPython) - Windows-7-6.1.7601-SP1
[debug] exe versions: ffmpeg N-94567-gc294f38c91, ffprobe N-94567-gc294f38c91, r
tmpdump 2.3
[debug] Proxy map: {}
[ndr] Morden-im-Norden-Zivilcourage: Downloading webpage
[ndr:embed] mordenimnorden276: Downloading JSON metadata
[ndr:embed] mordenimnorden276: Downloading f4m manifest
WARNING: Unable to download f4m manifest: HTTP Error 404: Not Found
[ndr:embed] mordenimnorden276: Downloading m3u8 information
mordenimnorden276 has no subtitles

C:\Windows\system32>

When I insert the Link into JDownloader 2 I get follow picture:

JDownloader 2 will find the subtitles, but youtube-dl not.
Why find the youtube-dl no subtitle but the jdownloader?
Is the error in the line [ndr:embed] mordenimnorden276: Downloading f4m manifest
WARNING: Unable to download f4m manifest: HTTP Error 404: Not Found
If "Yes", what is the solution to download f4m manifest and get the subtitle?