Интеграция Linkedin с web API с использованием oauth 2.0 (авторизация по этому запросу была отклонена.)

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I have already received an external token from linkedin

Now I wanted to register the authenticated linkedIn account to the local app account.

I am posting to the api/account/registerExternal passing along with the token that LinkedIn provided but I always get the message below.

"Authorization has been denied for this request."

I could not figure out what was causing this issue. Any hint would be helpful. thanks!

Что я уже пробовал:

Я пробовал следить за этим блогом.
https://leastprivilege.com/2013/11/26/dissecting-the-web-api-individual-accounts-templatepart-3-external-accounts/

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