CyberHappenings logo
☰
Home Browse Watchlists Experimental About

Track cybersecurity events as they unfold. Sourced timelines. Filter, sort, and browse. Fast, privacy‑respecting. No invasive ads, no tracking.

Microsoft 365 Service Disruption Affecting User Access

First reported
Last updated
1 unique sources, 2 articles

Summary

Hide ▲

Microsoft 365 applications are experiencing an outage preventing some users, particularly administrators with business or enterprise subscriptions, from accessing the Microsoft 365 admin center in North America and Canada regions. The incident was acknowledged by Microsoft, which is reviewing telemetry data to identify the root cause and develop a remediation plan. The disruption follows two other major incidents last week that impacted Microsoft 365 services due to MFA issues and Azure Front Door CDN problems. Previous outages in September were caused by an Exchange Online coding bug.

Timeline

  1. 13.10.2025 18:58 2 articles · 4mo ago

    Microsoft 365 Outage Affecting User Access

    Microsoft 365 applications are experiencing an outage preventing some users, particularly administrators with business or enterprise subscriptions, from accessing the Microsoft 365 admin center in North America and Canada regions. The incident was acknowledged by Microsoft, which is reviewing telemetry data to identify the root cause and develop a remediation plan. Users are experiencing degraded functionality and inability to raise support tickets through the Microsoft 365 admin center. The outage also affects the M365 app. Microsoft is analyzing diagnostic data from the Microsoft 365 admin center infrastructure, focusing on usage patterns and CPU utilization levels, and reviewing HTTP Archive (HAR) files provided by impacted users to support the investigation. The disruption follows two other major incidents last week that impacted Microsoft 365 services due to MFA issues and Azure Front Door CDN problems. Previous outages in September were caused by an Exchange Online coding bug.

    Show sources
    Open in new tab

Information Snippets

Similar Happenings

Verizon Wireless Outage Disrupts Cellular Service Nationwide

Verizon Wireless experienced a nationwide outage on January 14, 2026, caused by a software issue. The outage began around 12 PM ET, causing phones to enter SOS mode and lose cellular service. Affected users could only make emergency calls, and attempts to contact them resulted in an 'unavailable' message. New York City Emergency Management warned that some Verizon customers may be unable to reach 911 during the outage. Verizon has apologized and announced a $20 account credit for impacted customers, which has now been issued via text messages with redemption instructions.

Open in new tab

Microsoft 365 Desktop App Installation Blocked Due to Authentication Misconfiguration

Microsoft is addressing a bug preventing installation of Microsoft 365 desktop apps on Windows devices. The issue stems from misconfigured authentication components in versions 2508 (Build 19127.20358) and 2507 (Build 19029.20294). The bug has been impacting users since November 2nd, causing Office Client issues. Microsoft has developed and is testing a fix, with an update on progress expected by 6:30 PM UTC today. The incident, tagged as OP1192004, is considered critical with noticeable user impact. Additionally, Microsoft is resolving a separate issue (MO1176905) affecting access to multiple Microsoft 365 services for some admins and users.

Open in new tab

Microsoft DNS outage impacts Azure and Microsoft 365 services

Microsoft is currently experiencing a DNS outage affecting Azure and Microsoft 365 services worldwide. The incident began around 16:00 UTC and is causing server and website connection issues for tens of thousands of users. Affected services include Intune, Azure portals, Exchange admin center, and Azure Front Door CDN. The outage is preventing users from logging into company networks and accessing online business platforms, impacting various sectors including healthcare. Microsoft has acknowledged the issue and is actively working to restore services. Users may experience intermittent request failures or latency while trying to access some Microsoft services.

Open in new tab

AWS US-EAST-1 Region Outage Affects Multiple Services

An ongoing AWS outage in the US-EAST-1 region has caused widespread disruption to multiple services, including Amazon.com, Prime Video, Perplexity AI, Canva, Fortnite, and others. The outage, which began on October 19, affected users in various regions, including the United States and Europe, for over two days. AWS has acknowledged the issue and is working to mitigate it and identify the root cause. The outage is causing increased error rates and latencies for multiple AWS services, impacting both end-users and support operations. The outage was caused by a major DNS failure in the DynamoDB infrastructure, specifically a race condition that led to the accidental deletion of all IP addresses for the database service's regional endpoint. AWS has taken measures to prevent similar issues in the future, including disabling the buggy DNS automation globally and adding protective checks and improved throttling mechanisms. The outage highlighted the risks of relying on a single cloud provider and the need for resilient security strategies. AI-powered platforms like Wild Moose can help with rapid root cause analysis during outages, aiding in incident response.

Open in new tab

Microsoft 365 Services Outage Affects Teams, Exchange Online, and Admin Center

Microsoft 365 services, including Microsoft Teams, Exchange Online, and the admin center, are experiencing an outage that prevents users from accessing these services. The outage also affects Multi-Factor Authentication (MFA) and Microsoft Entra single sign-on (SSO) authentication. Users encounter errors when attempting to access the services, and Microsoft is working to resolve the issue. The outage is tracked on the Service Health Dashboard and is causing directory operations issues. Microsoft is providing updates on the Service Health Status page. This is the latest in a series of outages affecting Microsoft 365 services in 2025.

Open in new tab