Signout Behaviour change in Custom POlicy and Builtin user flow

I am having this strange issue with my Custom Policies…. Based on SocialAndLocalAccountsWithMfa starter pack. The behaviour that we are looking for is as follows and is achieved with User flows is When the user sign-outs form the application and then hits sign in again, he should be prompted for a reauthentication. But when I use the same app to execute custom Policy it will reauthenticate without entering creds. I have adjusted the but nothing. I added and changed following in

<UserJourneyBehaviors>
      <SingleSignOn Scope="Policy" KeepAliveInDays="7" />
      <SessionExpiryType>Rolling</SessionExpiryType>
      <SessionExpiryInSeconds>900</SessionExpiryInSeconds>
      <JourneyInsights TelemetryEngine="ApplicationInsights" InstrumentationKey="your-application-insights-key" DeveloperMode="true" ClientEnabled="false" ServerEnabled="true" TelemetryVersion="1.0.0" /-->
</UserJourneyBehaviors>

is there a way to check if there is a failure to sign out for the user or any way to debug the issue? Or way to change the behaviour?

The application goes to the logout URL when the user hits Signout form application.

https://mytenanct.b2clogin.com/mytenanct.onmicrosoft.com/b2c_1a_signup_signin/oauth2/v2.0/logout?post_logout_redirect_uri=https%3A%2F%2Flocalhost%3A44316%2F&x-client-SKU=ID_NET451&x-client-ver=5.4.0.0

Following is the url when user Clicks SignIn from the application and get logged in without authentication.

1. Request URL: https://mytenanct.b2clogin.com/mytenanct.onmicrosoft.com/b2c_1a_signup_signin/oauth2/v2.0/authorize?client_id=ac8ca2c8-4cc3-43e3-8fd3-dcd592557f99&redirect_uri=https%3A%2F%2Flocalhost%3A44316%2F&response_mode=form_post&response_type=code%20id_token&scope=openid%20profile%20offline_access%20https%3A%2F%2FMYTENANCT.onmicrosoft.com%2Fdemoapi%2Fread%20https%3A%2F%2FMYTENANCT.onmicrosoft.com%2Fdemoapi%2Fwrite&state=OpenIdConnect.AuthenticationProperties%3Du1frIXk828jwoiEmCMuqTDTomxyjWAjDSV2---SUMJX7jDgjnKFPX4iO5VEbXPGHVgHA6GcLzPWjooSpDcTxM9iAoRUGXxDbyhBCLexjWNEMG7dqSu-wa2AqntAbcV1a0mk9dykGyrypS8gsuPtbNPvkgO_8YRuYSlRiJy8tYSA&nonce=637285777554418842.MjY2ZmVjYmEtMDY0ZS00ZTljLTk0MDUtMzk2MzkxODAyODUyZjc0NTkxZGEtN2I5YS00ODViLThkZTYtMWIwMjUyNjg3ZTc2&x-client-SKU=ID_NET451&x-client-ver=5.4.0.0

Any Help will be highly appreciated to track it down or change the behaviour

I have also configured [Single-Sigout][1] but doesn’t change the behaviour.