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Microsoft 365 Copilot launch failure with multiple Office apps open

Service Disruption
First reported
Last updated
Happening score
H score 13
1 unique sources, 1 articles

Summary

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Microsoft is investigating a WebView2 bug that stops the Copilot pane from launching in Microsoft 365 when multiple Office apps are open at once. The disruption affects users of Excel, Word, PowerPoint, OneNote, Publisher, and Access, making a core productivity feature unavailable in common multi-app workflows. The issue matters because it can block access to Copilot until the app-session conflict is cleared.

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Timeline

  1. 06.10.2025 20:16 2 articles · 7mo ago

    Microsoft investigates Copilot launch failure in Microsoft 365

    Initial Disclosure

    Microsoft is investigating a WebView2-related bug in Microsoft 365 that can prevent the Copilot pane from launching when multiple Office applications are open simultaneously on the same system, including Excel, Word, PowerPoint, OneNote, Publisher, and Access; closing the first Office app can allow Copilot to open in the second, and other WebView2-dependent features such as Share and Room Finder are also affected.

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