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Business Central API grant type "client_credentials" / Oauth2

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Posted on by Soeren Frisk

Anyone succeeded in creating a connection to the Business central API (https://docs.microsoft.com/da-dk/dynamics-nav/api-reference/v1.0/)

Can see others have issues with it as well:

https://community.dynamics.com/business/f/dynamics-365-business-central-forum/292569/business-central-api---authentication-with-client-id-and-secret/914168#914168

https://github.com/MicrosoftDocs/dynamics365smb-devitpro-pb/issues/517

According to this: https://docs.microsoft.com/en-us/azure/active-directory/develop/v2-oauth2-client-creds-grant-flow

i should be able to create an auth token i can use on my server that is consuming the Business central API. But i alwaus get "401 Unauthorized" Or "400 Bad Request".

Can anyone help?

What i've done so far:

registered "Dynamics 365 Business Central" in Azure Active Directory
Added Client secret
Added API permissions for "Application permissions" for "Dynamics 365 Business Central"
Created Request in postman (changed client secret):

What am i doing wrong? Wrong scope? Or maybe wrong setup in AAD?

I really want to avoid using basic auth in production

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I Gusti Made Ari 3,600 on at

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Please check this post :

https://madearipermadi.com/2019/12/05/how-to-connect-to-business-central-apis-with-postman-and-aad-authentication/

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Soeren Frisk 10 on at

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Sorry the post explains "delegated permissions". Not "application permissions", i'll update my question to make that clearer. Thanks

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bc-developer 10 on at

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community.dynamics.com/.../oauth-2-0---grant_type---client_credentials---not-supported-in-bc-saas - i have the same problem

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Thenerdy 35 on at

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All if this helps anyone - I was getting something similar and what helped me was to add to the application in Azure - a scope of default without the .

In the scope section within Postman add the following:
https://api.businesscentral.dynamics.com/.default

This fixed the issue for me was able to add a valid token and using it

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DAnny3211 11,397 on at

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hi

look this

danieleincalza.blogspot.com/.../business-central-bye-bye-basic.html

danieleincalza.blogspot.com/.../oauth20-business-central-app.html

DANiele

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YUN ZHU 95,331 Super User 2025 Season 2 on at

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Just adding some info.

Using OAuth to connect Business Central APIs and Web Service in Postman

https://yzhums.com/20690/

Hope this helps as well.

Thanks.

ZHU

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