Cannot access Outlook on any device or browser

Question

Cannot access Outlook on any device or browser

Caitlyn LeBlanc 40

clientIPAddress cxxxxxx
X-ClientId: cxxxxxx
X-Auth-Error TWljcm9zb2Z0LkV4Y2hhbmdlLkRhdGEuRGlyZWN0b3J5LkFERHJpdmVyU3RvcmVB
Y2Nlc3NEYk9mZmxpbmVFeGNlcHRpb24= (Base64)
X-FEServer YT3PR01CA0066
X-BEServer TFYzUFIxNk1CNTc4Ng== (Base64)
Date:2025-09-12 1:25:59 AM
InnerException: TWljcm9zb2Z0Lk1hcGkuTWFwaUV4Y2VwdGlvbk1kYk9mZmxpbmU= (Base64)

nothing will login anywhere please help! I have cleared caches/cookies. Used different devices, internet hot spots, wifi and third party locations of friends. I cannot get into my email no matter how I try.

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Answer 1

Hi @Caitlyn LeBlanc

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

I'm really sorry you're running into this issue. I understand how critical it is to stay connected to your mailbox, and it’s frustrating when access problems disrupt your workflow.

This issue has been officially acknowledged by Microsoft. It’s currently affecting some users who are experiencing errors or failures when accessing their mailbox via any Exchange Online connection method including Outlook on desktop, mobile, and web.

Microsoft has identified the cause within a portion of the backend infrastructure and is actively working on restoring availability. Manual recovery actions have already begun, and early signs show gradual improvement. The team is closely monitoring progress before expanding the fix to remaining affected systems.
Scope of impact: This incident isn't region-specific, and the problem could impact some of your users attempting to access their mailbox using any Exchange Online connection method.

-Start time: Thursday, September 11, 2025, at 12:00 PM UTC
-Next update by: Friday, September 12, 2025, at 3:30 AM UTC

This incident is being treated with the highest priority and may impact users globally. You can follow updates via the Microsoft 365 Health dashboard if you have admin access.

In the meantime, no action is required from you. Once the fix is fully deployed, access to your mailbox should be restored automatically.

Thank you again for your patience and understanding as Microsoft works toward full recovery.

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