Angular2 material dialog has issues – Did you add it to @NgModule.entryComponents?

Angular 9.0.0 <

Since 9.0.0 with Ivy, the entryComponents property is no longer necessary. See deprecations guide.

Angular 9.0.0 >

You need to add dynamically created components to entryComponents inside your @NgModule

@NgModule({
  declarations: [
    AppComponent,
    LoginComponent,
    DashboardComponent,
    HomeComponent,
    DialogResultExampleDialog        
  ],
  entryComponents: [DialogResultExampleDialog]

Note: In some cases entryComponents under lazy loaded modules will not work, as a workaround put them in your app.module (root)