[it.dplay.com] Authentication or cookies.txt or netrc doesn't work

[fpusersuggest]

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2020.06.16.1
• 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 --cookies /home/myuser/Downloads/cookies.txt --verbose "https://it.dplay.com/investigation-discovery/il-tuo-peggior-incubo/stagione-3-episodio-6/"
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--cookie', u'/home/mysuse/Downloads/cookies.txt', u'--verbose', u'https://it.dplay.com/investigation-discovery/il-tuo-peggior-incubo/stagione-3-episodio-6/']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2020.06.16.1
[debug] Python version 2.7.17 (CPython) - Linux-5.3.0-62-generic-x86_64-with-Ubuntu-19.10-eoan
[debug] exe versions: ffmpeg 4.1.4-1build2, ffprobe 4.1.4-1build2, phantomjs 2.1.1, rtmpdump 2.4
[debug] Proxy map: {}
[debug] Using fake IP 79.28.3.201 (IT) as X-Forwarded-For.
[DPlay] il-tuo-peggior-incubo/stagione-3-episodio-6: Downloading token
[DPlay] il-tuo-peggior-incubo/stagione-3-episodio-6: Downloading JSON metadata
[DPlay] il-tuo-peggior-incubo/stagione-3-episodio-6: Downloading JSON metadata
ERROR: This video is only available for registered users. Use --username and --password or --netrc to provide account credentials.
Traceback (most recent call last):
File "./youtube-dl/youtube_dl/extractor/dplay.py", line 163, in _get_disco_api_info
display_id, headers=headers)['data']['attributes']['streaming']
File "./youtube-dl/youtube_dl/extractor/common.py", line 892, in _download_json
expected_status=expected_status)
File "./youtube-dl/youtube_dl/extractor/common.py", line 870, in _download_json_handle
expected_status=expected_status)
File "./youtube-dl/youtube_dl/extractor/common.py", line 660, in _download_webpage_handle
urlh = self._request_webpage(url_or_request, video_id, note, errnote, fatal, data=data, headers=headers, query=query, expected_status=expected_status)
File "./youtube-dl/youtube_dl/extractor/common.py", line 645, in _request_webpage
raise ExtractorError(errmsg, sys.exc_info()[2], cause=err)
ExtractorError: Unable to download JSON metadata: HTTP Error 403: Forbidden (caused by HTTPError()); please report this issue on https://yt-dl.org/bug . Make sure you are
using the latest version; type youtube-dl -U to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
File "./youtube-dl/youtube_dl/YoutubeDL.py", line 797, in extract_info
ie_result = ie.extract(url)
File "./youtube-dl/youtube_dl/extractor/common.py", line 530, in extract
ie_result = self._real_extract(url)
File "./youtube-dl/youtube_dl/extractor/dplay.py", line 247, in _real_extract
url, display_id, host, 'dplay' + country, country)
File "./youtube-dl/youtube_dl/extractor/dplay.py", line 172, in _get_disco_api_info
self.raise_login_required()
File "./youtube-dl/youtube_dl/extractor/common.py", line 936, in raise_login_required
expected=True)
ExtractorError: This video is only available for registered users. Use --username and --password or --netrc to provide account credentials.

Description

I tried different way to authenticate. With the classic --username --password that doesn't work because of captcha. I tried the .netrc file. And I tried with cookies flag. I exported the cookies.txt file with different addon on firefox:

• https://addons.mozilla.org/it/firefox/addon/export-cookies-txt/
• https://addons.mozilla.org/it/firefox/addon/cookies-txt-one-click/
• https://addons.mozilla.org/it/firefox/addon/cookies-txt/

and this one on chrome:

• https://chrome.google.com/webstore/detail/cookiestxt/njabckikapfpffapmjgojcnbfjonfjfg

Obviously I was logged on it.dplay.com
I also tried to change the user-agent string with that one is on my browser.
I checked also other closed bugs, but it didn't help. In my opinion they should not be closed.
I also tried netrc + cookies.
The folowing is my .netrc file in my home:
$ cat /home/myusersss/.netrc
machine dplay login mylogin@gmail.com password xxxxxxxxxxxxxxxxxxx

Anyway it doesn't work.