如何订阅角度为 15 的拦截器内的可观察对象？

Question

appp.module.ts

import { AppComponent} from './app.component';
import { ManageActionsComponent } from './components/match'
import { NgModule} from '@angular/core';
import { AppRoutingModule } from './app-routing.module';
import { UICInterceptor } from './modules/shared/services/inerceptor/UICInterceptor';
import { NgSelectModule } from '@ng-select/ng-select';
import { BrowserAnimationsModule } from @angular/platform-browser/animations';
import { ErrorInterceptor } from './modules/shared/services/inerceptor/error-interceptor';

@NgModule({
declarations: [
 AppComponent,
 ManageActionsComponent,
],
imports: [
 AppRoutingModule,
 NgSelectModule,
 BrowserAnimationsModule,
],
providers: [
 {
  provide: HTTP_INTERCEPTORS,
  useClass: UICInterceptor,
  multi: true,
 },
 {
  provide: HTTP_INTERCEPTORS,
  useClass: ErrorInterceptor,
  multi: true,
 }
],
bootstrap: [AppComponent],
})
export class AppModule {}

manageActions.component.ts

errorMessage: string = '';
constructor (
 private readonly api: HttpCallsService,
 private errorInterceptor: ErrorInterceptor
){}

ngOnInit(): void {
 this.errorInterceptor.errorMessage$.subscribe(errorMessage=>{
 console.log('errorMessage in component', errorMessage);
 this.errorMessage = errorMessage;
 });
 this.retriveActions();

error-interceptor.ts

import BehaviorSubject, Observable, Subject, throwError) from 'rxjs';
import { retry, catchError, finalize} from 'rxjs/operators';
import Injectable } from '@angular/core';
import {
HttpEvent,
HttpInterceptor,
HttpHandler,
HttpRequest,
HttpErrorResponse,
@Injectable({
providedIn: 'root',
export class ErrorInterceptor implements HttpInterceptor {
constructor() {}
private errorMessage = new BehaviorSubject<string>('asdfsd');
errorMessage$ = this.errorMessage.asObservable();
intercept(
request: HttpRequest<unknown>,
next: HttpHandler
): Observable<HttpEvent<unknown>> {
 return next.handle (request).pipe(
  catchError((error: HttpErrorResponse) => {
   let errorMessage = ¹¹;
   if (error.error instanceof ErrorEvent) {
     // client-side error
     errorMessage = "Error: $[error.error.message}`;
   } else {
    // server-side error
    errorMessage = Error Code: $[error.status}\nMessage: ${error.message}`;
    console.log('This is the value', errorMessage)
   }
   this.errorMessage.next(errorMessage);
   return throwError(()->errorMessage);
   }),
   finalize(()=> {})
   );
 }
}

我正在尝试订阅 manageActionComponent 并在 html 文件中显示 'errorMessage' 属性的任何更新，但可观察对象只采用拦截器文件中分配的第一个值，在本例中为 '' 空字符串，然后它不会再更新了

我尝试将订阅设置为 takeUntil(NEVER) 但这也不起作用。我已经尝试将 setTimeout() 设置为 100，但也没有用。

我做错了什么吗？请让我知道，这是我第一次使用拦截器，所以我可能做错了。