TeamExplorer in Visual Studio 2019: Page Not Found

On a new PC I installed Visual Studio 2019 and everything work nicely. But after installing GitHub Extension for Visual Studio I see this error in team explorer after picking work items:

This error stays after rebooting my machine, starting visual studio as administrator and uninstalling/installing GitHub Extension for Visual Studio.

Please click here here for version numbers of all used components.

I was searching the internet for a solution. Please see below what I tried so far to fix the issue. None of these could fix my issue:

• Start Visual Studio 2019 as Administrator.

• Start "Developer Command Prompt for VS 2019" as administrator and enter devenv.exe /setup

• In Control Panel right clicked "Visual Studio 2019" and chose "Change". Then I repaired my Visual Studio 2019 installation.

• terminate Visual Studio and rename this directory to something else and restart visual studio 2019: C:\Users\myuseruname\AppData\Local\Microsoft\VisualStudio\16.0_7db0a03b\ComponentModelCache After starting visual studio 2019 the above directory with new content is newly created, but the issue stays.

• In Visual Studio 2019 in Menü Extensions/ManageExtension disable all extensions and disable roaming for all extensions.

• start "Developer Command Prompt for VS 2019" as administrator and enter devenv.exe /Log c:\temp\vs2019.xml. Then Observe content of vs2019.xml in powershell with command get-content c:\temp\vs2019.xml -tail 100 -wait. But no additional entries are added to logfile c:\temp\vs2019.xml when I change in Team Explorer to workitem and the error page not found is shown.

• to solve issues with potentially corrupted data in user profile I decided to started Visual Studio 2019 with a new user profile. For this I started "Developer Command Prompt for VS 2019" as administrator and entered devenv.exe /devenv.exe /rootsuffix profile2

After trying all the above steps the issue remained.

I found the solution! The issue only disappears if all these steps are done together:

• Close all instances of VS
• Delete all files in C:\Users\myuseruname\AppData\Local\Microsoft\VisualStudio\14.0\ComponentModelCache
• Start "Developer Command Prompt for VS 2019" as administrator and enter devenv.exe /setup