Issue with Postman Request to BC250: Error Using Client Credentials Grant Type

StanT
StanT Member Posts: 1
in NAV Three Tier
Hello everyone,

I am currently facing an issue with my Postman request to a BC250 environment.

Environment Details:
  • BC250: On-premises installation
  • ClientServicesCredentialType: AccessControlService
  • Authentication Setup: OpenID Connect with OAuth, successfully configured

When using Postman with the Authorization Code grant type, I can successfully obtain an access token by logging in with my user credentials.

When attempting to obtain an access token using the Client Credentials grant type, I encounter the following error:
Error: invalid_grant, Description: AADSTS501051: Application '<applicationid>' (<applicationName>) is not assigned to a role for the application '<applicationid>' (<applicationName>)

Steps Taken:
  • Confirmed that OpenID Connect and OAuth are correctly set up.
  • Verified that the Authorization Code grant type works without issues.

Does anyone know how to resolve this issue? Specifically:
  • Is there a missing configuration in Azure AD or Business Central that could be causing this?
  • Do I need to assign specific roles or permissions to the application for Client Credentials to work?

Any insights or guidance would be greatly appreciated!
Thank you in advance.

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