How do I fix this and get into my outlook inbox? I was recently set up with my email from work and the IT department cannot figure it out

Question

How do I fix this and get into my outlook inbox? I was recently set up with my email from work and the IT department cannot figure it out

Steven Alterio 0

UTC Date: [Moderator note: Personally Identifiable Information removed]
Client Id: [Moderator note: Personally Identifiable Information removed]
Session Id: [Moderator note: Personally Identifiable Information removed]
Client Version: [Moderator note: Personally Identifiable Information removed]
BootResult: configuration
Back Filled Errors: Unhandled Rejection: Error: 500:undefined|undefined:undefined
err: Microsoft.Exchange.Clients.Owa2.Server.Core.OwaUserHasNoMailboxAndNoLicenseAssignedException
esrc: StartupData
et: ServerError
estack: Error: 500

Ryan-N 16,940 Reputation points Microsoft External Staff Moderator

2026-06-16T20:52:42.3466667+00:00

Hi @Steven Alterio ,

I hope everything is going well on your end.

I’m following up on the support thread we've been working through together. I wanted to check in and see if the information I shared in my previous answer helped resolve the issue you were experiencing.

If you're still experiencing any issues or have further questions, please feel free to reach out at any time. I’m always happy to help if you need anything else.

I want to ensure everything is functioning smoothly and that your experience remains seamless.

Thank you again for your collaboration throughout the troubleshooting process. I look forward to hearing from you soon.

Warm regards,

3 answers

Your answer

Ryan-N 16,940 Reputation points Microsoft External Staff Moderator

2026-06-16T20:52:42.3466667+00:00

Hi @Steven Alterio ,

I hope everything is going well on your end.

I’m following up on the support thread we've been working through together. I wanted to check in and see if the information I shared in my previous answer helped resolve the issue you were experiencing.

If you're still experiencing any issues or have further questions, please feel free to reach out at any time. I’m always happy to help if you need anything else.

I want to ensure everything is functioning smoothly and that your experience remains seamless.

Thank you again for your collaboration throughout the troubleshooting process. I look forward to hearing from you soon.

Warm regards,

Answer 1

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Answer 2

Hi @Steven Alterio ,

Welcome to the Microsoft Q&A forum.

Based on the information you provided, your account currently does not have a mailbox.

To resolve this issue, please contact your administrator and ask them to perform the following steps:

Step 1: Go to admin.microsoft.com

Step 2: Click Users > Active users > select your account name

Step 3: Click Licenses and apps, then remove the current license. After about 5 minutes, assign the license again.

After that, please wait an additional 5 minutes and check whether the mailbox has been activated.

Step 4: Click on Apps under Licenses and apps > locate Exchange Online

If it is not selected, please check the box to enable it
If it is already selected, uncheck it, wait about 5 minutes, then check it again and verify whether you can use Outlook

User's image

If the issue is still not resolved, please ask your administrator to contact Microsoft technical support so they can investigate the issue further at the system level.

You can also provide your administrator with the article below to help them contact Microsoft technical support:

Get support - Microsoft 365 admin | Microsoft Learn

I hope this information is helpful. Please follow these steps and let me know if it works for you. If not, we can work together to resolve this.

Thank you for your patience and your understanding. If you have any questions or need further assistance, please feel free to share them in the comments on this post so I can continue to support you.

I look forward to continuing the conversation.

If the answer is helpful, please click "Accept Answer" and kindly upvote it.

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.

Answer 3

The error OwaUserHasNoMailboxAndNoLicenseAssignedException means the work account can sign in, but Exchange Online does not see a mailbox or the required license assigned. This must be fixed by the organization’s Microsoft 365/Exchange administrator; it cannot be fixed from the user side.

Actions the tenant administrator needs to take:

Verify a mailbox exists
- In the Microsoft 365 admin/Exchange admin tools, check whether the user has an Exchange Online mailbox.
- If the mailbox is missing or disabled, create or re‑enable the mailbox for the user.
Verify license assignment
- Confirm the user has an appropriate Microsoft 365 license that includes Exchange Online assigned and active.
- If no such license is assigned, assign one and wait for provisioning to complete.
Re-test sign-in
- After the mailbox is created/re-enabled and the license is correctly assigned, sign out of all Microsoft sessions, close the browser, then sign back in to Outlook on the web and try again.

If the organization’s IT department cannot resolve this, they need to open a support case with Microsoft 365 support from the Microsoft 365 admin portal so Microsoft can check the tenant configuration and mailbox state.

References: