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Issue with Email Sending via Web Service – Graph API Authorization Error

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Posted on by Rahul Mathur

Hi,

We are trying to send emails via a web service call by using the standard "Enqueue" function from codeunit 8901 "Email", which enqueues emails to be sent in the background.

However, we are encountering the following error: "You are not authorized to access this resource: https://graph.microsoft.com/.default. Contact your system administrator."

Azure AD App Configuration: We have registered an application in Azure AD and granted all necessary permissions.

Despite this configuration, we are still unable to send emails via the web service. Any advise what might be missing or misconfigured?

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Microsoft Dynamics NAV

Dynamics 365 Business Central

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KP - Solution Archi... 658 on at

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Hi,

Can you check the extension management setup

If allowHttp Client is enabled.

This can help you resolve.

Thanks,

KP

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Khushbu Rajvi. 22,435 Super User 2026 Season 1 on at

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Hope this helps:https://community.dynamics.com/forums/thread/details/?threadid=8e13e660-fda1-ef11-8a69-7c1e520d2459

https://learn.microsoft.com/en-us/graph/resolve-auth-errors

https://learn.microsoft.com/en-us/answers/questions/1330026/the-user-is-not-authorized-to-access-this-resource

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Ramesh Kumar 7,561 Super User 2026 Season 1 on at

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Under API Permissions, ensure the following Application Permissions are granted (not just Delegated):

Mail.Send

User.Read

Optional: Mail.ReadWrite, MailboxSettings.Read

Thanks you

Ramesh Kumar

If this was helpful, please check the "Does this answer your question?" box and mark it as verified.

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Gerardo Rentería Ga... 26,834 Most Valuable Professional on at

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Hi, good day
I hope this can help you, and give you some hints.

Authorization Error When Sending Sales Invoice via Email Using Business Central API

Trying to send invoice via an API call... not authorized

Best Regards
Gerardo

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YUN ZHU 101,202 Super User 2026 Season 1 on at

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Hi, If you use standard functions to send emails, you do not need to set permissions in Azure.
You just need to make sure that the Email Account has been set up in BC.

For example,

If you use the Graph API completely, you should send an HTTP request. Please confirm your approach first.

https://learn.microsoft.com/en-us/graph/api/message-send?view=graph-rest-1.0&tabs=http

Hope this helps.

Thanks.

ZHU

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