Microsoft Copilot desktop opens to a completely white screen – WebView2 Runtime investigation on Windows 11

I am experiencing an issue with the standalone Microsoft Copilot desktop application on Windows 11 Version 26H2.

When I launch Copilot, the application opens to a completely white screen, with no logo, loading indicator, text or interface. However, Copilot works normally through the web browser.

System information

• Windows 11 Version 26H2

Copilot desktop: 157.0.4341.46

WebView2 Runtime: 157.0.4341.46

WebView2 investigation

WebView2 does not appear in Installed Apps or Programs and Features.

Its installation directory and uninstall Registry entry are present.

The uninstall entry shows SystemComponent = 1.

Registry checks

I checked the WebView2 registration in the Windows Registry under both Microsoft EdgeUpdate registry paths.

First path

HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\EdgeUpdate\Clients\{F3017226-FE2A-4295-8BDF-00C3A9A7E4C5}

Second path

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\EdgeUpdate\Clients\{F3017226-FE2A-4295-8BDF-00C3A9A7E4C5}

Registry Editor redirects the second path to the first.

Signing out and back into Copilot did not resolve the issue.

I understand that Microsoft has reported service incident EX1550543 affecting Microsoft 365 connectivity.

I have not made any Registry modifications.

Questions for Microsoft

Is this WebView2 registration and visibility behaviour expected?

Since WebView2 Evergreen Runtime is pre-installed on Windows 11, can Microsoft confirm that its installation and Registry registration are correct, even though it is not listed in Installed Apps? Is it normal that the Evergreen Bootstrapper is not listed after installation?

Reference: https://github.com/MicrosoftDocs/edge-developer/blob/main/microsoft-edge/webview2/concepts/end-user-faq.md
During my PowerShell investigation, the expected Copilot host executable could not be located: undocked_copilot\copilotapphost.exe.

Thank you.