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OAuth POST method not working

Received Response

We are doing App to App integration in EPM. We are using OAuth 2.0 Client Credentials for Authentication.

 We have created Confidential APP and are able to get access token using Client ID, Client Secret, Grant Type - Client Credentials , Scope

 When we perform GET method using the access token generated, we are able to do it successfully with Target EPM APP.

 But when we perform POST method using the access token generated , we get invalid client credentials error. Below is the sample of the error


"details": "Invalid credentials.",

"status": 9,

"links": [



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