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REST API, POST customer request failed

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Posted on by MG-04060224-0

I'm trying to create customer in business central using REST API with postman.

I got token using OAuth2/Microsoft Entra Authentication.
Dynamics 365 Business Central have /API.ReadWrite.All/ permission in azure portal.
Client ID/Application have ADMINISTRATOR, D365 FULL ACCESS permission in Business Central -> Microsoft Entra Application

Get request to https:/api.businesscentral.dynamics.com/v2.0/tenantid/environmentname/api/v2.0/companies(id)/customers works fine but post request returns:

400 Bad Request
{
/error/: {
/code/: /Internal_ServerError/,
/message/: /Sorry, the current permissions prevented the action. (TableData 5050 Contact Insert: Base Application) CorrelationId: 09bb1b44-5240-47d4-9e1e-55ea966ef3f9./
}
}

What am I doing wrong? Where should I set required permissions?

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Dynamics 365 Business Central

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Stefano Demiliani 37,166 Most Valuable Professional on at

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Check the permissions associated to the app registration inside BC.

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YUN ZHU 98,345 Super User 2026 Season 1 on at

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Hi, It looks like you haven't assigned permissions to the MS Entra App.

Hope the following can give you some hints.

Thanks.

ZHU

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MG-04060224-0 8 on at

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Which Application ID should I use in Client ID part? For testing with postman and external, custom-made web.

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DAnny3211 11,407 Super User 2026 Season 1 on at

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hi

look documentation here:

https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/administration/automation-apis-using-s2s-authentication#task-2-set-up-the-microsoft-entra-application-in-

DAniele

https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/administration/automation-apis-using-s2s-authentication

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Judy Microsoft Employee on at

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Hi, please check the steps to set up service-to-service authentication:

The reference Document:Using Service to Service Authentication - Business Central | Microsoft Learn

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Ariba Mehdi 166 on at

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Hi,
Try creating XML file that generates permission set. You can go to visual studio where the extension is open. Open command palette and select the following. The xml file will be created. Build the extension again and run it.

Hope this helps!

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