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Getting "HTTP Error 401 - Unauthorized: Access is denied" while trying to access Dynamics 365 Online resource using Client Credentials

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I am trying to get Dynamics 365 online data using access token received on successful authentication by using client credentials for an Web app / API application . However getting 401 always.

Here is what I am doing:

Authentication

Request URL:
POST https://login.microsoftonline.com/tenantId/oauth2/token

Request Headers:
Content-Type: application/x-www-form-urlencoded
Accept: application/json

Request Body:
client_id: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxx
resource: domain.crm.dynamics.com
grant_type: client_credentials
client_secret: xxxxxxxxxxxxxxxxxxxxxxxxxxxxx=

Response Status: 200 OK
Response Body (Sample):
{
"token_type": "Bearer",
"expires_in": "3599",
"ext_expires_in": "0",
"expires_on": "1524644921",
"not_before": "1524641021",
"resource": "domain.crm.dynamics.com",
"access_token": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
}
Request a Dynamics resource using the received access_token

Request URL:
GET https://domain.crm.dynamics.com/api/data/v8.2/accounts?$select=name

Request Headers:
Accept: application/json
OData-MaxVersion: 4.0
OData-Version: 4.0
Authorization: Bearer {{access_token}}

Response Status: 401 Unauthorized
Response Body: HTTP Error 401 - Unauthorized: Access is denied
Response Headers:
WWW-Authenticate: Bearer authorization_uri=https://login.windows.net/tenantId/oauth2/authorize, resource_id=domain.crm.dynamics.com

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Ryan Spain 52 on at

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RE: Getting "HTTP Error 401 - Unauthorized: Access is denied" while trying to access Dynamics 365 Online resource using Client Credentials

Hi Suvasish,

Three things worth checking here given the error response:

1. Required Permissions

Add permissions to the App Registration to access Dynamics CRM Online(see item 1 in screenshot below). Then use the "Grant permissions" button.

2. Application User
Ensure that an Application User in setup in Dynamics using the Client ID(see item 2 in screenshot below) from the App Registration in Azure.

3. Security Role
Ensure that a custom security role is assigned to the above Application User. You can just do a copy of System Administrator or similar.

Hope this helps,

Ryan

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