Teams will not start

Teams refuses to open or closes immediately? These steps bring the client back.

Last verified: 2026-04-13

Affected systems

windows macos

Quick fixes

Kill all Teams processes in Task Manager and relaunch
Clear the Teams cache
Make sure WebView2 is installed

Quick test

Press Ctrl + Shift + Esc and kill all Teams processes. Relaunch the client. This is often enough after sleep or screen lock.

Clear cache (the main fix)

Classic client:

%appdata%\Microsoft\Teams

New client:

%localappdata%\Packages\MSTeams_8wekyb3d8bbwe\LocalCache

Verify WebView2 runtime

The new Teams client requires the Microsoft Edge WebView2 runtime. Look for it in Apps and Features and install if missing.

If Teams reports a sign-in code, check the matching error page. Related errors are listed at the bottom of this page.

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