youtube-dl https://youtu.be/Q-xxxx-xxxx
[youtube] Q-xxxx-xxxx: Downloading webpage
[youtube] Q-xxxx-xxxx: Downloading video info webpage
WARNING: Unable to extract video title
ERROR: This video is unavailable.

youtube-dl --username=me@gmail.com  https://youtu.be/Q-xxxx-xxxx
Type account password and press [Return]:
[youtube] Downloading login page
[youtube] Looking up account info
[youtube] Logging in
Type 2-step verification code and press [Return]:
[youtube] Submitting TFA code
WARNING: Unable to submit TFA code: HTTP Error 400: Bad Request
[youtube] Q-xxxx-xxxx: Downloading webpage
[youtube] Q-xxxx-xxxx: Downloading video info webpage
WARNING: Unable to extract video title
ERROR: This video is unavailable.

youtube-dl --cookies=cookies.txt  https://youtu.be/Q-xxxx-xxxx
Traceback (most recent call last):
  File "/usr/bin/youtube-dl", line 11, in <module>
    load_entry_point('youtube-dl==2018.6.14', 'console_scripts', 'youtube-dl')()
  File "/usr/lib/python3.6/site-packages/youtube_dl/__init__.py", line 472, in main
    _real_main(argv)
  File "/usr/lib/python3.6/site-packages/youtube_dl/__init__.py", line 439, in _real_main
    with YoutubeDL(ydl_opts) as ydl:
  File "/usr/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 414, in __init__
    self._setup_opener()
  File "/usr/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 2303, in _setup_opener
    self.cookiejar.load()
  File "/usr/lib/python3.6/http/cookiejar.py", line 1784, in load
    self._really_load(f, filename, ignore_discard, ignore_expires)
  File "/usr/lib/python3.6/http/cookiejar.py", line 2007, in _really_load
    filename)
http.cookiejar.LoadError: 'cookies.txt' does not look like a Netscape format cookies fil

youtube-dl --username=me@gmail.com --password=xxxxxxxxx youtu.be/Q-xxxxxxxx
[youtube] Downloading login page
[youtube] Looking up account info
[youtube] Logging in
WARNING: Unable to login: Invalid password
[youtube] Q-xxxxxx: Downloading webpage
[youtube] Q-xxxxxx: Downloading video info webpage
WARNING: Unable to extract video title
ERROR: This video is unavailable.