im trying to add movies into my list, im using the version 4 of the api cause i want to add one or more movies at once

curl --location 'https://api.themoviedb.org/4/8223725/items' \
--header 'Content-Type: application/json' \
--header 'Authorization: Bearer **************' \
--data '{
  "items": [
    {
      "media_type": "movie",
      "media_id": 550
    },
    {
      "media_type": "movie",
      "media_id": 244786
    }
  ]
}'

but im getting the error below, i dont know why:

{
    "status_code": 34,
    "status_message": "The resource you requested could not be found.",
    "success": false
}