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403 Forbidden Error when accessing Extended Table Data from Production Environment

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Posted on by Shihab Ahmed Efty

I'm encountering a strange issue when trying to access extended table data from my Dynamics 365 production environment. The same API call works perfectly fine in the sandbox environment, but in production, I consistently receive a 403 Forbidden error with the following message:

I've already verified that the user I'm using for the API call has the necessary permissions to access the extended table data in production. I've also checked the environment settings and security configurations, but couldn't find anything out of the ordinary.

Here's a breakdown of what I've tried so far:

Sandbox vs. Production: The API call works in sandbox but fails in production.

Permissions: Verified that the user has the correct permissions.

Environment Settings: Checked settings and security configurations.

Thanks in advance!

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Dynamics 365 Business Central

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Gerardo Rentería Ga... 25,213 Most Valuable Professional on at

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Hi

I hope this can help you and give you some hints.

Have you been able to check if the MS Entra application has the custom extension permission?

How to generate Permission Sets using the Visual Studio Code for Business Central Extensions – Code the Coffee

Using OAuth to connect Business Central APIs and Web Service in Postman | Dynamics 365 Lab

Best

GR

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Shihab Ahmed Efty 13 on at

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@gdrenteria thank you for your responses.
I’ve attached a screenshot to show my current setup and the steps I followed based on your suggestions. Could you please take a look and let me know if there’s anything I might have missed or if there’s something wrong in my setup?

Any insights you have would be really helpful—I appreciate your time and support!

I am tring this way also

Same Issue in Sandbox Env it is working fine only facing issue on Production env

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Ramesh Kumar 7,527 Super User 2025 Season 2 on at

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Hi Shihab,

Please check the permissions and permission sets on the Business Central Entra app, and also ensure that the app has "Read", "Write", and "Modify" enabled in the Azure App setup.

Thanks

Ramesh

If this helped you, please check the box Does this answer your question?

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

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Hi, please check the app permissions for OAuth authentication.

More details:

https://yzhums.com/20690/

Thanks.

ZHU

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Suresh Kulla 50,243 Super User 2025 Season 2 on at

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Please check this link, make sure you set the Permissions on the OAuth for the user

https://www.encorebusiness.com/blog/how-to-enable-oauth-for-dynamics-365-business-central/

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Khushbu Rajvi. 20,363 Super User 2025 Season 2 on at

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Hope this helps: https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/webservices/web-service-troubleshooting

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Gerardo Rentería Ga... 25,213 Most Valuable Professional on at

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Hi

Please follow the steps above and visit this page to review the permission settings.

Best

GR

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