I'm developing an Android App with Retrofit2 and Kotlin. When I try request to API with GET method with Access Token as Header, the API show me this message: "Unauthorized" (code: 401).

My code is this:

interface:

@GET("list/{list_id}")
    fun getList(
        @Header("Authorization") auth: String,
        @Path("list_id") list_id: Int,
        @Query("page") page: Int,
        @Query("api_key") api_key: String,
        @Query("language") language: String,
        @Query("sort_by") sort_by: String
    ): Call<List>

request:

private val url = "https://api.themoviedb.org/4/"

fun retrofit(): API {
        val retrofit = Retrofit.Builder()
            .baseUrl(url)
            .addConverterFactory(GsonConverterFactory.create())
            .build()
        return retrofit.create(API::class.java)
    }

class:

val call = request.retrofit().getList("Bearer " + token, 1, "", "", "", "")

call.enqueue(object : Callback<List> {
            override fun onResponse(call: Call<List>, response: Response<List>) {}
            override fun onFailure(call: Call<List>, t: Throwable) {}
})