Hi @Peterjc ,
Browser authentication forms are typically used in intranets that have Windows authentication. Instead of forms authentication.
Take a look at IIS express configurations: %USERPROFILE%\Documents\IISExpress\config\applicationhost.config Make sure authentication settings are correct and not affecting you.
There should not be any entry for your application. Also the default value for windows authentication should be false: <windowsAuthentication enabled="false">
You can open the Properties window in Visual Studio. Set Anonymous Authentication to Enabled and Windows Authentication to Disabled.
https://zcusa.951200.xyz/en-us/troubleshoot/developer/webapps/aspnet/development/forms-based-authentication
Best regards,
Lan Huang
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