My Outlook receives following message, microsoft.exchange.data.storage.tenantaccessblocked exception error 500, need to unblock

Question

UTC Date: 2026-06-03T19:46:21.135Z
Client Id: [Moderator note: Personally Identifiable Information removed]
Session: [Moderator note: Personally Identifiable Information removed]
Client Version: 20260522011.09
BootResult: configuration
Back Filled Errors: Unhandled Rejection: Error: 500:undefined|undefined:undefined
err: Microsoft.Exchange.Data.Storage.TenantAccessBlockedException
esrc: StartupData
et: ServerError
estack: Error: 500
    at Object.w [as createStatusErrorMessage] (https://res.public.onecdn.static.microsoft/owamail/hashed-v1/msalv5/scripts/owa.mailindex.3510ebc1.js:1:806)
    at https://res.public.onecdn.static.microsoft/owamail/hashed-v1/msalv5/scripts/owa.mailindex.3510ebc1.js:1:185693
st: 500
ehk: X-OWA-Error
efe: [Moderator note: Personally Identifiable Information removed]
ewsver: 15.21.92.6
reqid: [Moderator note: Personally Identifiable Information removed]
cv: [Moderator note: Personally Identifiable Information removed]

Answer 1

Hi @Daniel Kneese,

Thank you for sharing these error details with me. 

The error message Microsoft.Exchange.Data.Storage.TenantAccessBlockedException indicates that your Microsoft 365 tenant has been blocked at the organization level, meaning the issue is not caused by a glitch within the Outlook web app itself. 

In most cases, this occurs due to a subscription or billing issue, a recently renewed subscription that hasn't fully propagated across Microsoft's servers, or a tenant state that is currently flagged as suspended or disabled.

 

To help you regain access to your Outlook as quickly as possible, your IT department's Global Administrator will need to log into the Microsoft 365 admin center and review the organization's status. Please coordinate with your administrator to have them complete the following troubleshooting steps: 

1/ Verify and resolve billing issues 

• Sign in to the Microsoft 365 Admin Center and navigate to Billing > Bills & payments to check for and settle any overdue balances. 
• Go to Billing > Your products, select the primary Microsoft 365 or Exchange Online subscription, and check its active status. 
• If the subscription status is marked as Suspended or Disabled, select Reactivate subscription and follow the prompts (which may include updating the payment method on file). 

Note: If your administrator confirms that the billing is already completely up to date, they can skip this step. 

2/ Confirm user licensing 

The admin should also verify your specific user account to ensure you still have a valid Exchange Online or Microsoft 365 license actively assigned to you.

Please note that after clearing overdue balances or reactivating a subscription, it typically takes 1–3 hours (and up to 24 hours in some scenarios) for Microsoft to fully restore services across their backend systems. During this replication window, you may continue to see the "Tenant is blocked" error message.

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If everything in the admin center already shows as active and the issue continues to persist past the replication window, the Global Admin will need to open a support request so Microsoft can review the tenant state from the service side. 

• Detailed submission instructions can be found here: Get support - Microsoft 365 admin. 
• If your administrator prefers phone assistance, they can locate the correct regional contact number using this link: Global Customer Service phone numbers - Microsoft Support. 
• Additionally, if your subscription is managed through a Microsoft partner or reseller, you can reach out to them directly, as they are authorized to open a support request and liaise with Microsoft on your behalf. 

I hope this helps clarify the underlying cause of the block and outlines the correct next steps to get you back up and running. 

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Answer 2

The error Microsoft.Exchange.Data.Storage.TenantAccessBlockedException with status 500 and TenantAccessBlockedError indicates that access to the tenant (organization) is blocked at the service level. This is a tenant-wide condition in Exchange Online/Microsoft 365, not something that can be fixed from the Outlook client.

Action steps:

1. Confirm whether the issue is temporary
   • In similar cases, users have reported that the error was temporary and resolved itself after a short period. Wait at least 30–60 minutes and try signing in to Outlook on the web and Teams again.
2. Contact the Microsoft 365 tenant administrator
   • Because the error is tenant-level, an administrator of the Microsoft 365 organization must investigate.
   • The admin should:
     • Sign in to the Microsoft 365 admin portal and check the service health dashboard for Exchange Online and Microsoft 365 services.
     • Check for any compliance, billing, or suspension notices that might indicate the tenant has been blocked.
     • If the tenant appears healthy but users still see TenantAccessBlockedException, open a support ticket from the Microsoft 365 admin center and provide the error details (including TenantAccessBlockedException, HTTP 500, and the UTC timestamp).
3. While waiting for admin or service resolution
   • Sign out of all Microsoft 365 sessions in the browser.
   • Clear browser cache and cookies, then try again in an InPrivate/Incognito window.
   • If the error persists across browsers and devices, this further confirms it is a tenant/service issue and must be handled by the tenant admin and/or Microsoft support.

End users cannot unblock this condition themselves; only tenant administrators working with Microsoft support can remove the tenant-level block.

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References:

• Tried loggin into Teams and Outlook and got this message on outlook, and unable to log into teams. - Microsoft Q&A