Got Forbidden 403 when using audio url for voice generate video

when im create didnt using this it can be generate

"video_inputs": [
    {
      "character": {
        "type": "avatar",
        "avatar_id": "Adriana_Nurse_Front_2_public",
        "scale": 1,
        "avatar_style": "normal"
      },
      "voice": {
        "type": "silence"
      },
      "background": {
        "value": "#f6f6fc",
        "type": "color"
      }
    }
  ]

but when im using audio with audio url got 403 forbidden

"video_inputs": [
    {
      "character": {
        "type": "avatar",
        "avatar_id": "Adriana_Nurse_Front_2_public",
        "scale": 1,
        "avatar_style": "normal"
      },
      "voice": {
        "type": "audio",
        "audio_url" : "url.com"
      },
      "background": {
        "value": "#f6f6fc",
        "type": "color"
      }
    }
  ],

anyone have solution?