Business Central SaaS (27.3) - Email sending error

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Posted on by MM-26020204-0

Issue Overview
Newly created users in the Business Central SaaS environment (version 27.3) are unable to send emails (approval notifications, background/job queue–driven emails).

Existing users are not affected.

The error observed is: “You are not authorized to access this resource: https://graph.microsoft.com/.default.”

The users have the same bc Licences and bc permission and have the same office 365 licences.

The email account being used is 'Current User' and the notification is trigerred by a standard approval workflow.

Is anyone having this issue and any idea how to troubleshoot as debugging it in AL is impossible as the functions for the token retrieval are blocked.

The code is breaking at this line : "Email - OAuth Client"(CodeUnit 4507).TryGetAccessTokenInternal - Email - Outlook REST API by Microsoft version 27.3.44313.46295

Thanks in advance

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Dynamics 365 Business Central

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OussamaSabbouh 10,630 Super User 2026 Season 1 on at

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Hello,

This error happens because the new users don’t have Microsoft Graph consent/authorization for sending email via the Current User connector, even though their BC and M365 licenses match existing users; Business Central uses Microsoft Graph to send email, and if admin consent hasn’t been granted (or mailbox/Graph permissions aren’t fully provisioned), token retrieval fails at TryGetAccessTokenInternal; fix it by granting admin consent in Entra ID for the Business Central enterprise app, verifying the users have active Exchange Online mailboxes, and checking Email Outbox/telemetry for confirmation—existing users work because consent was already granted earlier.

Regards,
Oussama Sabbouh

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