Not able to sign in

Question

Not able to sign in

Michelle Amoroso 0

Hello-

I am trying to access our accounts and not being able too. Appreciate any help.

[Moderator note: Personally Identifiable Information removed]

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2 answers

Your answer

Answer 1

Michelle Amoroso 0

This is the error message that I am receiving. I have personally not changed any settings, one day we were just unable to access the email both from the app on my phone and my laptop.

UTC Date: 2026-07-10T22:12:26.190Z
Client Id: 
Session Id: 
Client Version: 20260703008.05
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
    at Object.w [as createStatusErrorMessage] (https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.87a8e2c4.js:1:806)
    at https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.87a8e2c4.js:1:188841
st: 500
ehk: X-OWA-Error
efe: MW4P220CA0021
ewsver: 15.21.159.18
reqid: 
cv:

Chris Duong 10,705 Reputation points Microsoft External Staff Moderator

2026-07-10T22:32:04.5433333+00:00
Hi Michelle,

Thank you very much for sharing the detailed error information.

As a forum moderator, I genuinely wish I could directly access your account or review the backend systems to diagnose and resolve this issue for you. However, our role here is limited to providing general guidance by offering clear next steps, sharing applicable resources, and directing you to the appropriate support channels so you can work with the right team to investigate further.

Based on the error message you provided:

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

This issue appears to be related to the mailbox or Exchange Online license assigned to your account. In most cases, this error means that the account either does not currently have an Exchange Online mailbox provisioned, or the account does not have an active license that includes Exchange Online access.

If your account was provided by your school or educational institution, it is most likely managed by your school’s Microsoft 365 administrator, so please contact your school IT department to verify that your Microsoft 365 Education license is active, Exchange Online is enabled, and a mailbox has been properly provisioned for your account.

When contacting your school IT team, please include the full error details you shared here, especially the following information:

UTC Date

Client ID

Session ID

Request ID

Error message: OwaUserHasNoMailboxAndNoLicenseAssignedException

These details may help them investigate the issue more effectively.

In case you do not know who is your IT admin, kindly refer to this article: How do I find my Microsoft 365 admin? - Microsoft Support

I hope this can be resolved for you soon. Please contact if you need anything else.

Answer 2

Hi Michelle,

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

I understand that you are unable to access your accounts. To assist you more effectively, could you please provide the following information?

Are you using a Microsoft personal account (Outlook.com/Hotmail), or a work/school account provided by an organization (Microsoft 365/Exchange)?
What error message do you receive when attempting to sign in? Please provide the exact wording or a screenshot if possible.
When did the issue first start occurring?
Have there been any recent changes to the account, such as password resets, security updates, licensing changes, or tenant configuration changes?

Please feel free to share the information in the comment below. Once I have it, I'll be better positioned to guide you through the next steps.

Thank you for your patience and understanding.

I'm looking forward to hearing your thoughts.

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