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Shared mailboxes not functioning.

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Posted on by Inkey Solutions

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Greetings.

Iam trying to setup emails for one of the companies, but I am unable to send any test emails from my email account setup in Business Central but it shows error which is as follows:

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Dynamics 365 Business Central

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Ben Baxter 5,921 Super User 2025 Season 1 on at

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Shared mailboxes not functioning.

Are you (or the User in question) setup as a member of the Shared Mailbox? Members have the ability to send on-behalf of the shared mailbox. Check your shared mailbox settings to ensure it is properly configured and that you can access it through your normal Outlook Web App.

Best Regards,

Ben Baxter

Accent Software Inc
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Mohana Yadav 60,260 Super User 2025 Season 1 on at

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Shared mailboxes not functioning.

Does the user account has Exchange Online license assigned in M365?
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YUN ZHU 86,030 Super User 2025 Season 1 on at

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Shared mailboxes not functioning.

Hi, it seems to be a problem with the email side, please double check that the email address is valid.

https://learn.microsoft.com/en-us/answers/questions/1161425/graph-api-mailboxnotenabledforrestapi-the-mailbox?cid=kerryherger

https://learn.microsoft.com/en-us/answers/questions/761931/microsoft-graph-api-throws-the-mailbox-is-either-i

Hope this helps.

Thanks.

ZHU
Inge M. Bruvik 1,029 Moderator on at

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Shared mailboxes not functioning.

Your error message is not visible.

Maybe you can try to add your error message again so we can see what it reads?