Angular SSR router outlet content render issue

I have build a project with angular 8. It also includes lazy routing with dynamic import. So when I tried to integrate SSR for this existing project I could manage to render styles in page view source.But no content rendered inside <router-outlet></router-outlet> tag.So can any one help on this regards, that what extra things need to do for render content.When I create brand new test project it works with adding angular universal (SSR) module.But in case of existing project it only render styles not any content inside router outlet directory.