Hello.

The subtitles part of the Example Request on the following page is an array, not an Object.

POST media/subtitles/create | Docs | Twitter Developer Platform

I think the correct request is as follows.

{
      "media_id":"692797692624265216",
      "media_category":"TweetVideo",
      "subtitle_info": {
        "subtitles": [{ // CHANGE HERE!
          "media_id":"105195515189863968",
          "language_code":"EN", //The language code should be a BCP47 code (e.g. 'en", "sp"),
          "display_name":"English"
        }]  // CHANGE HERE!
      }
    }

Could you please check the documentation?

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