IMDb lists it with tt3973198 @ https://www.imdb.com/title/tt3973198/ as "TV-MA" and means its Season 2 Episode 4
the TMDb page https://www.themoviedb.org/movie/374430-white-christmas?language=en-US looks good, also listed as "TV" but without Season or Episode numbers
but if we search via API https://api.themoviedb.org/3/find/tt3973198?api_key=[totallysecret]&language=en-US&external_source=imdb_id we have 2 results?!

at least tv_episode_results seems wrong episode_number 1 should be 4 and season_number 0 should be 2

{
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      "id": 374430,
      "video": false,
      "vote_count": 712,
      "vote_average": 8.4,
      "title": "Black Mirror: White Christmas",
      "release_date": "2014-12-16",
      "original_language": "en",
      "original_title": "Black Mirror: White Christmas",
      "genre_ids": [
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      ],
      "backdrop_path": "/rMCew7St2vy9iV3QOPzx15sAkFJ.jpg",
      "adult": false,
      "overview": "In a mysterious and remote snowy outpost, Matt and Potter share a Christmas meal, swapping creepy tales of their earlier lives in the outside world, but are both men who they appear to be?",
      "poster_path": "/he609rnU3tiwBjRklKNa4n2jQSd.jpg",
      "popularity": 9.323
    }
  ],
  "person_results": [],
  "tv_results": [],
  "tv_episode_results": [
    {
      "air_date": "2014-12-16",
      "episode_number": 1,
      "id": 1188308,
      "name": "White Christmas",
      "overview": "In a mysterious and remote snowy outpost, Matt and Potter share a Christmas meal together, swapping creepy tales of their earlier lives in the outside world.",
      "production_code": "204",
      "season_number": 0,
      "show_id": 42009,
      "still_path": "/gztDBJ4y4HKKuzOzT4rvOzZMm22.jpg",
      "vote_average": 8.212,
      "vote_count": 33
    }
  ],
  "tv_season_results": []
}