OAuth implementation with WINUI unpackaged app not working

Question

In MAUI application, I have implemented OAuth by opening up a browser window and redirecting user back to app once authentication is complete using protocol mentioned in Package.appxmanifest file as below:

<Extensions>
  <uap:Extension Category="windows.protocol">
    <uap:Protocol Name="appName">
      <uap:DisplayName>App</uap:DisplayName>
    </uap:Protocol>
  </uap:Extension>
</Extensions>

This is working fine with packaged WINUI application. But in unpackaged app version redirection to app is not working. I have implemented oAuth using browser because WebAuthenticationBroker is not working in MAUI for WINUI.

Tried with WinUIEx package. But it requires packaged application.

Any suggestions will be helpful.

Thank you.