Problems with mail

Question

If I go to the administration I see for all our user in the mail section : This user doesn't have an Exchange Online license.

Answer 1

Hi @Eddy Jacob

Thank you for posting your question in the Microsoft Q&A forum.  

Looks like your users are unable to use email because they do not have an Exchange Online license assigned. 

Their accounts exist in Azure AD and Microsoft 365, but no plan that includes Exchange Online is currently assigned. Without an Exchange Online license, Microsoft 365 will not provision a mailbox, which prevents email from working. 

To resolve this, review the user’s licenses and assign a plan that includes Exchange Online. 

 

Reference: Assign or unassign licenses for users in the Microsoft 365 admin center - Microsoft 365 admin | Mic… 

Note: Mailbox provisioning may take up to 15 minutes, and in some cases, it can take as long as 24 hours for the mailbox and all related services to become fully available. 

I hope this helps. 

Please feel free to correct me if I misunderstood your request. If you have any additional concerns, feel free to comment below. I would be more than happy to assist. 

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Answer 2

In the Microsoft 365 admin center, the message “This user doesn't have an Exchange Online license” in the mail section means that no Exchange Online–enabled product license is assigned to those users. Without an Exchange Online license, a user mailbox is not created or usable in Exchange Online.

To fix this for users who should have mailboxes:

1. Go to the Microsoft 365 admin center → Users → Active users.
2. Select a user who should have email.
3. In the user details, check Product licenses and confirm that a plan including Exchange Online (for example, an Office 365 Enterprise plan) is assigned.
4. If no such license is assigned, edit the product licenses and assign one that includes Exchange Online.
5. Repeat for each user who needs a mailbox.

After assigning a license, mailbox provisioning can take up to about 15 minutes, and in some cases up to 24 hours before everything is fully available. If a user previously had a license that was removed, the mailbox can be reconnected only if the license is reassigned within 30 days of removal; after that, the mailbox is permanently deleted and cannot be recovered.

If the purpose of an address is only to function as a queue or shared mailbox, consider using a shared mailbox instead, which does not require an Exchange Online license.

If licenses are correctly assigned and the mail section still shows no Exchange Online license after 24 hours, contact Microsoft Support via the Microsoft 365 admin center so they can check the tenant and mailbox provisioning.

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References:

• Fix NDR error "550 5.1.10" in Exchange Online
• "Email can't be received because the license is invalid for the mailbox" error when selecting Test & Enable Mailbox
• You can't find a user in the offline address book in Microsoft 365
• Delays in provisioning of user/mailbox or synchronizing changes in Exchange Online
• Can't access the mailbox of an unlicensed user in Exchange Online
• Manage mail users in Exchange Online