MAUI sample on UWP crashes on login

[dvaca-sml]

When I click the login button, I get the following exception:

System.InvalidOperationException: You need to declare the windows.protocol usage of the protocol/scheme myapp in your AppxManifest.xml file at Microsoft.Maui.Authentication.WebAuthenticatorImplementation.AuthenticateAsync(WebAuthenticatorOptions webAuthenticatorOptions) at MauiApp2.MauiAuthenticationBrowser.InvokeAsync(BrowserOptions options, CancellationToken cancellationToken)

I tried adding this to the manifest but I couldn't get it to work. And I couldn't find any help or documentation online.