Dynamics 365 Online S2S Authentication - Full Explain
Server-to-Server (S2S) authentication (only support Dynamics 365 online) was great, it use ClientId/SecretKey to authentication (instead use UserName/Password) and it use without Dynamics 365 license.
But everybody have problem when use CllientId/SecretKey, the main problem is HTTP Error 401 - Unauthorized: Access is denied
I headache this problem more than 3 days, and now, I succeed authentication with ClientId/SecretKey.
This post I will fully explain you how I can achieve it.
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