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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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Inge M. Bruvik 1,161 Moderator on at

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Your error message is not visible.

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

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YUN ZHU 98,128 Super User 2026 Season 1 on at

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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

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Mohana Yadav 61,180 Super User 2026 Season 1 on at

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Does the user account has Exchange Online license assigned in M365?

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Ben Baxter 6,819 Super User 2026 Season 1 on at

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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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