error in outlook

I noticed that you’re using English in your posts although this is an Arabic forum so I’ll continue in English so my answer is as clear and helpful as possible. If you’d prefer me to switch to Arabic just let me know and I’ll gladly do so.

Hi @Information Security,

Please understand that our forum is a public platform, and we will modify your question to cover your personal information including your organization domain name in the description. Please notice to hide these personal or organization information next time you post error or some information to protect personal data.    

I have moved the information to the Private message if you need to add any more privacy information please add it in there.

Regarding your issue, may I kindly ask a few questions so I can understand your issue better:  

• Is your account a personal account (e.g., Gmail, Hotmail) or a work/school account (typically associated with a domain name like your company or school)? 
• Does this issue happen when you use Outlook desktop? 
• Does this also happen with other users? 
• Have you tried clearing browser cache (for Outlook on the web) or accessing Outlook using a private incognito window to see if the issue persists? 

The error message

Microsoft.Exchange.Clients.Owa2.Server.Core.OwaUserHasNoMailboxAndNoLicenseAssignedException 

means that your account either does not have a mailbox provisioned or has not been assigned a valid Microsoft 365 license that includes Exchange Online access. 

Since end-user could not fix this issue on their own, you need to ask your IT Admin (Microsoft 365 admin) to help with it. 

Here are a few steps they should try: 

1. Verify license  

• Go to the Microsoft 365 Admin Center. 
• Select Users > Active users. 
• 
• Select your account and check under Licenses and Apps. 
• Ensure that a valid license (e.g., Microsoft 365 Business Standard, E3, or E5) is assigned and active. 

2. Reassign the license 

If the license is missing or was recently modified:  

• Assign the appropriate license. 
• If already assigned, try removing and reassigning it to trigger mailbox provisioning.  

3. Wait for Mailbox Provisioning 

• After assigning or updating the license, allow a few hours for the mailbox to be provisioned then login to Outlook on the web again.
• If it still doesn’t work after that, contact your Microsoft 365 admin for deeper investigation.  

Hopefully it will help work with your issue and if you have any other questions or need further assistance, feel free to ask.  

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".  

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread