https://learn.microsoft.com/en-us/uwp/api/windows.security.authentication.web.webauthenticationbroker.authenticatesilentlyasync?view=winrt-28000
WebAuthenticationBroker.AuthenticateSilentlyAsync Method (Windows.Security.Authentication.Web) -...
Starts the asynchronous authentication operation silently (no UI will be shown) with one input. You can call this method multiple times in a single application...
windows securitymethodauthenticationweb