这也要解决。
Remove the TFS related credentials from Credential Manager
In Credential Manager add the new updated Generic Credentials for the TFS account. Generally,this would overwrite the cached credentials.
Close all Visual Studio instances,delete %LOCALAPPDATA%\.IdentityService as you did.
Clear TFS caches %LOCALAPPDATA%\Microsoft\Team Foundation\7.0\Cache
Clear all the browser caches especially for the stored password
Restart Visual Studio > Team Explorer > Manage Connections to check if the Enter credential dialog popup. Just try this several times. Based on my test the dialog will popup the first time,but if you cancel it,then you have to restart VS to popup it again.
Run Visual Studio as another user:
cd C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\Common7\IDE
runas /netonly /user:<account> devenv.exe
Enter the user possword,then Team Explorer > Manage Connections
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