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Small and medium business | Business Central, N...

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code":"Authentication_InvalidCredentials",The server has rejected the client credentials.

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Posted on by CU02121744-0

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Hi Everyone.

The endpoint calls failed due to the Expired Secret Key. I have created a new Secret Key from the Portal. And Now the Token is getting created.
But throws this error for the API Calls. I have verified that the client Credentials are configured correctly for authentication.

Also in Business Central Entra app.

Would really appreciate your help in this issue.
Thanks

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Dynamics 365 Business Central

Microsoft Dynamics NAV

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Grigorios Mavrogeorgis 2,772 Super User 2026 Season 1 on at

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Hi,

yeah that's right, and it's probably the missing piece here. Getting a token back doesn't mean it's the right token, BC will happily reject a perfectly valid AAD token if the audience isn't right. Scope needs to be https://api.businesscentral.dynamics.com/.default, not the Graph default or something copied from another integration, that's the mistake I've seen most.
Second thing, separate from the token itself, is the Entra Applications page in BC. Search that in Tell Me. The Client ID entry there needs to be Enabled and have a permission set actually assigned to it, rotating the secret in Azure doesn't touch that record at all so if it was already fine before it should still be fine now.

If the scope and the BC-side app record both check out, then look at the actual response, 401 usually means the token itself is wrong (audience/scope), 403 means the token's fine but the identity behind it has no rights.

Glad to help - follow up if anything is unclear.
► If this solved it, marking it verified helps others too.
Regards,
Grigorios Mavrogeorgis
Business Central Consultant & AL Developer
Work: Gmsoft Limited
Blog: insidebusinesscentral
LinkedIn: linkedin.com/in/gregorymavrogeorgis

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