Users may have been unable to access Microsoft 365 web-based services correctly when using Google Chrome

A post-incident report has been published.

A post-incident report has been published.

A post-incident report has been published.

Title: Users may have been unable to access Microsoft 365 web-based services correctly when using Google Chrome User impact: Users may have been unable to access Microsoft 365 web-based services correctly when using Google Chrome. More info: Impacted users may have experienced Microsoft 365 web apps and portals not rendering as expected when accessed via the Google Chrome browsers. This may have included, but was not limited to: - Microsoft 365 admin center failing to load or missing UI elements such as search bars or pages - An inability to open Excel or PowerPoint files through Microsoft 365 web pages - Issues accessing apps such as OneDrive and Planner through the browser This issue only impacted the latest version of Google Chrome (Version 147). Other browsers, including Microsoft Edge, were unaffected. As a workaround, impacted users could have used the Microsoft Edge browser. Additionally, desktop based clients were unaffected, and users may have been able to leverage these services. Final status: We've completed the mitigation actions, and telemetry showed that the issue is resolved. Users may need to refresh their browser pages to experience relief. Scope of impact: Some users attempting to access Microsoft 365 web-based services via Google Chrome (version 147) may have been impacted. Start time: Wednesday, April 15, 2026, at 7:00 PM UTC End time: Thursday, April 16, 2026, at 11:56 AM UTC Preliminary root cause: As part of broad changes related to DigiCert Global Root CA (G1), Google Chrome no longer trusts these authentication configurations (more information can be found https://knowledge.digicert.com/alerts/digicert-root-strategy-aligning-with-industry-standards). In preparation, most Microsoft 365 web-based services had transitioned to an alternate authentication configuration authorities, however, a small number were not fully addressed. Once the Google Chrome change occurred, the authentication configurations were no longer accepted, resulting in impact. Next steps: - For a more comprehensive list of next steps and actions, please refer to the Post Incident Report document.

We believe this issue only impacts the latest versions of Google Chrome (Version 147). We continue to take action to identify impacted authentication configurations and take the relevant actions. Users may need to refresh their browser page to experience relief. This quick update is designed to give the latest information on this issue.

Title: Users may be unable to access Microsoft 365 web-based services correctly when using Google Chrome User impact: Users may be unable to access Microsoft 365 web-based services correctly when using Google Chrome. More info: Impacted users may experience Microsoft 365 web apps and portals not rendering as expected when accessed via the Google Chrome browsers. This may include, but is not limited to: - Microsoft 365 admin center failing to load or missing UI elements such as search bars or pages - An inability to open Excel or PowerPoint files through Microsoft 365 web pages - Issues accessing apps such as OneDrive and Planner through the browser Other browsers, including Microsoft Edge, appear to be unaffected. As a workaround, impacted users can use the Microsoft Edge browser. Additionally, desktop based clients are unaffected, and users may be able to leverage these services. Current status: We are updating the authentication components across various service endpoints to remediate the impact. Action has already been taken on a number of endpoints, and internal testing following these changes is showing improvement. Users may need to refresh the browser page to experience relief. Start time: Wednesday, April 15, 2026, at 7:00 PM UTC Scope of impact: Some users attempting to access Microsoft 365 web-based services via Google Chrome may be impacted. This information may be updated as our investigation continues. Next update by: Thursday, April 16, 2026, at 1:30 PM UTC

Title: Users may be unable to access Microsoft 365 web-based services correctly when using Google Chrome User impact: Users may be unable to access Microsoft 365 web-based services correctly when using Google Chrome. More info: Impacted users may experience Microsoft 365 web apps and portals not rendering as expected when accessed via the Google Chrome browsers. This may include: - Missing UI elements such as search bars, pages or the Microsoft 365 admin center failing to load. - An inability to open Excel or PowerPoint files through Microsoft 365 web pages. - Issues accessing apps such as OneDrive and Planner. Other browsers, including Microsoft Edge, appear to be unaffected. As a workaround, impacted users can use the Microsoft Edge browser. Current status: We're suspecting that this issue may be related to a broader industry authentication component change affecting how some browsers validate certain authentication components. We’re working to confirm the relationship and determine the appropriate next steps. Scope of impact: Some users attempting to access Microsoft 365 web-based services via Google Chrome may be impacted. This information may be updated as our investigation continues. Next update by: Thursday, April 16, 2026, at 1:00 PM UTC

Title: Users may be unable to access Microsoft 365 web-based services correctly when using Google Chrome User impact: Users may be unable to access Microsoft 365 web-based services correctly when using Google Chrome More info: Impacted users may experience Microsoft 365 web apps and portals not rendering as expected when accessed via the Google Chrome. This may include: - Missing UI elements such as search bars, pages or the Microsoft 365 admin center failing to load. - An inability to open Excel or PowerPoint files through Microsoft 365 web pages. - Issues accessing apps such as OneDrive and Planner. Other browsers, including Microsoft Edge, appear to be unaffected. As a workaround, impacted users can use the Microsoft Edge browser. Current status: We're suspecting that this issue may be related to a broader industry authentication component change affecting how some browsers validate certain authentication components. We’re working to confirm the relationship and determine the appropriate next steps. Scope of impact: Your organization is affected by this event, and some users attempting to access Microsoft 365 web-based services via Google Chrome may be impacted. This information may be updated as our investigation continues. Next update by: Thursday, April 16, 2026, at 12:00 PM UTC

Title: Some users may be unable to access Microsoft 365 web-based services correctly when using Google Chrome User impact: Users may be unable to access Microsoft 365 web-based services correctly when using Google Chrome. More info: Impacted users may experience Microsoft 365 web apps and portals not rendering as expected when accessed via the Google Chrome browser. This may include: - Missing UI elements such as search bars, pages or the Microsoft 365 admin center failing to load. - An inability to open Excel or PowerPoint files through Microsoft 365 web pages. - Issues accessing apps such as OneDrive and Planner following a recent Google Chrome update. Other browsers, including Microsoft Edge, appear to be unaffected. Current status: We’ve received reports indicating an issue with Microsoft 365 web-based services not rendering or appearing correctly when accessed via Google Chrome. We’re reviewing service monitoring telemetry to isolate the root cause and determine our next troubleshooting steps. Scope of impact: Your organization is affected by this event, and some users attempting to access Microsoft 365 web-based services via Google Chrome may be impacted. This information may be updated as our investigation continues. Next update by: Thursday, April 16, 2026, at 10:00 AM UTC