question

I'm trying to develop a Smart Home Skill, but i can't go on with the discovery procedure.

My skill id is: amzn1.ask.skill.b9236e0b-6daf-455c-9fac-270106175329

The skill correctly login with account linking and is anabled, but when alexa launches the discovery procedure it fails with an "INVALID_ACCESS_TOKEN_EXCEPTION".

I use the same token i retrieve from the discovery directive!

This is what i got from Alexa

{
    "directive": {
        "header": {
            "namespace": "Alexa.Discovery",
            "name": "Discover",
            "payloadVersion": "3",
            "messageId": "e525927f-2ace-415b-9776-0158817a0229"
        },
        "payload": {
            "scope": {
                "type": "BearerToken",
                "token": "Atza|IwEBIC6G9nx5BPmczjAauLUjNlrZkn0rNt0ZoIuihvHPCoiqM8bWt7T3l8wKbjMz2brLiSQBHWgmkjxOL8qF7xUUDCDdRxifZhvzsxmevBZ_z6tE-Ns8wp-ewRKWkIqhEvJJEyIIm87uGCLhP8YlqSGDgNNW9B0Pd_MsYMdO379tiJWtkpaO3YzLS44X7WNwHrSwFEHL5M8dypIssJwTjxQR-NayERdEX83Wk5D8APjziktzUUAH__vctVpIRAqme5nmVWFlq7IWpfOjXhIusSZofn6YNGwBmazUcOr1BT7xTBeF7UPsylMVMfjYsUs7rVOiOKeb93iiysmjQjoanxUqtirty8PPz0RRTVXWrkUlGNffcwpOp2NeNEk2AX3MCBu5V7s2vmn4kni708ZZrEdzULPOMRRakQ-ZqMInF_bzla2ZH4lp3ztVwNINgRicRmJR-TI-5HG-RxJxV4XEpmLpxrT2FjpNjK3hCv1_EjcPHbN1vPyZ4P0WUv16lcAh0dJnT-CefBkCrxgo22pOEGRG9eZd"
            }
        }
    }
}

Then i reply with this sample code:

header

{
    "Authorization": "Bearer Atza|IwEBIC6G9nx5BPmczjAauLUjNlrZkn0rNt0ZoIuihvHPCoiqM8bWt7T3l8wKbjMz2brLiSQBHWgmkjxOL8qF7xUUDCDdRxifZhvzsxmevBZ_z6tE-Ns8wp-ewRKWkIqhEvJJEyIIm87uGCLhP8YlqSGDgNNW9B0Pd_MsYMdO379tiJWtkpaO3YzLS44X7WNwHrSwFEHL5M8dypIssJwTjxQR-NayERdEX83Wk5D8APjziktzUUAH__vctVpIRAqme5nmVWFlq7IWpfOjXhIusSZofn6YNGwBmazUcOr1BT7xTBeF7UPsylMVMfjYsUs7rVOiOKeb93iiysmjQjoanxUqtirty8PPz0RRTVXWrkUlGNffcwpOp2NeNEk2AX3MCBu5V7s2vmn4kni708ZZrEdzULPOMRRakQ-ZqMInF_bzla2ZH4lp3ztVwNINgRicRmJR-TI-5HG-RxJxV4XEpmLpxrT2FjpNjK3hCv1_EjcPHbN1vPyZ4P0WUv16lcAh0dJnT-CefBkCrxgo22pOEGRG9eZd",
    "Content-Type": "application/json;charset=UTF-8"
}

payload

{
    "event": {
        "header": {
            "namespace": "Alexa.Discovery",
            "name": "Discover.Response",
            "payloadVersion": "3",
            "messageId": "b4c48994-a2b1-49c1-a2d7-89eda7e99ae3"
        },
        "payload": {
            "endpoints": [
                {
                    "endpointId": "appliance-001",
                    "friendlyName": "Living Room Light",
                    "description": "Smart Light by Sample Manufacturer",
                    "manufacturerName": "Sample Manufacturer",
                    "displayCategories": [
                        "LIGHT"
                    ]
                }
            ],
            "scope": {
                "type": "BearerToken",
                "token": "Atza|IwEBIC6G9nx5BPmczjAauLUjNlrZkn0rNt0ZoIuihvHPCoiqM8bWt7T3l8wKbjMz2brLiSQBHWgmkjxOL8qF7xUUDCDdRxifZhvzsxmevBZ_z6tE-Ns8wp-ewRKWkIqhEvJJEyIIm87uGCLhP8YlqSGDgNNW9B0Pd_MsYMdO379tiJWtkpaO3YzLS44X7WNwHrSwFEHL5M8dypIssJwTjxQR-NayERdEX83Wk5D8APjziktzUUAH__vctVpIRAqme5nmVWFlq7IWpfOjXhIusSZofn6YNGwBmazUcOr1BT7xTBeF7UPsylMVMfjYsUs7rVOiOKeb93iiysmjQjoanxUqtirty8PPz0RRTVXWrkUlGNffcwpOp2NeNEk2AX3MCBu5V7s2vmn4kni708ZZrEdzULPOMRRakQ-ZqMInF_bzla2ZH4lp3ztVwNINgRicRmJR-TI-5HG-RxJxV4XEpmLpxrT2FjpNjK3hCv1_EjcPHbN1vPyZ4P0WUv16lcAh0dJnT-CefBkCrxgo22pOEGRG9eZd"
            }
        }
    }
}

I put the access token both in the header and in the scope.

I've done many tests (token only in header and viceversa) but with the same result: this is what i get

{
    "header": {
        "namespace": "System",
        "name": "Exception",
        "messageId": "a4658eb3-6e00-4b78-826d-9e0ec9ddeb45"
    },
    "payload": {
        "code": "INVALID_ACCESS_TOKEN_EXCEPTION",
        "description": "Access token is not valid."
    }
}

There's a thing i did not clearly undertand: when i make account linking all seems to going on in the rigth way. The account linking ends with this page

and the skill is anabled.

But my lambda doesn't receive any trigger: is it right?

My lambda is triggered only when alexa send the discovery directive with the access token.

Hope you can help me, i'm very frustrated.