I am trying to setup an angular (19) app, within an Nx project, with keycloak authentication. The problem I am facing is that, after successfully building the app, I get the following error in the browser console when accessing it and the app does not load:

main.2bf01af6f4d363d0.js:1 TypeError: A is not a constructor

where the A is inside this generated function:

function G(e) {
    const i = new A(e.config), <------ This is the line with the error
        n = e.providers ?? [],
        t = U(i);
    return (0,
        s.makeEnvironmentProviders)([{
        provide: k,
        useValue: t
    }, {
        provide: A,
        useValue: i
    }, ...n, L(i, e)])
}

In the call stack, this is what invokes it:

u.provideKeycloak)(s)

Which makes me understand that the error is with the providers setup in app.config.ts:

import { ApplicationConfig, provideZoneChangeDetection } from '@angular/core';
import { provideRouter } from '@angular/router';
import { appRoutes } from './app.routes';
...
const environment = {...};
...
export const appConfig: ApplicationConfig = {
  providers: [
    createAuthConfig(environment),
    provideZoneChangeDetection({ eventCoalescing: true }),
    provideRouter(appRoutes),
  ],
};

Where createAuthConfig looks like this:

export function createAuthConfig(environment) {
  // Create URL condition for bearer token
  const urlCondition = createInterceptorCondition<IncludeBearerTokenCondition>({
    urlPattern: new RegExp(`...`),
    bearerPrefix: 'Bearer'
  });

  const provideCfg : ProvideKeycloakOptions = {
    config: {
      url: ...,
      realm: ...,
      clientId: ...
    },
    initOptions: {
      onLoad: 'check-sso',
      silentCheckSsoRedirectUri: window?.location.origin + '/assets/silent-check-sso.html',
      checkLoginIframe: false
    },
    features: [
      withAutoRefreshToken({
        onInactivityTimeout: 'logout',
        sessionTimeout: 60000 // 1 minute
      })
    ],
    providers: [
      AutoRefreshTokenService,
      UserActivityService,
      {
        provide: INCLUDE_BEARER_TOKEN_INTERCEPTOR_CONFIG,
        useValue: [urlCondition]
      },
      provideHttpClient(withInterceptors([includeBearerTokenInterceptor]))
    ]
  };

  console.log('Keycloak config:', provideCfg);
  return provideKeycloak(provideCfg);
}

This issue DOES NOT occur when serving the app through the dev server.

Any idea what could be wrong?