RxJs BehaviourSubject doesn't give its current value to forkJoin.pipe - rxjs

Question

import { UserManager, UserManagerSettings, User } from 'oidc-client';
export class AuthService {
private manager = new UserManager(getClientSettings(this.appSettingsService));
private userSubject: BehaviorSubject<User>;
private get user(): Observable<User> { return this.userSubject.asObservable();}
constructor(private appSettingsService: AppSettingsService) {
this.userSubject = new BehaviorSubject<User>(null);
this.manager.getUser().then(user => {
if (user) {
this.userSubject.next(user);
localStorage.setItem('access_token', user.access_token);
}
});
}
isAuthenticated(): Observable<boolean> {
return this.user.pipe(map((user: User) => {
return (user != null && !user.expired) || !!localStorage.getItem('access_token');
}));
get access_token(): Observable<string> {
return this.user.pipe(map((u: User) => {
if (u && u.access_token) {
return u.access_token;
}
if (!!localStorage.getItem('access_token')) {
return localStorage.getItem('access_token');
}
return undefined;
}));
}
isInRole(roleName: string): Observable<boolean> {
console.log(`AuthService.isInRole ${roleName}`);
return forkJoin({ isAuthenticated: this.isAuthenticated(), access_token: this.access_token })
.pipe(map(fj => {
console.log(`AuthService.isInRole.pipe ${roleName}`);
if (!fj.isAuthenticated || !fj.access_token) {
return false;
}
var claims: object = jwt_decode(fj.access_token);
if ('role' in claims && claims['role'].indexOf(roleName) !== -1) {
console.log(`AuthService.isInRole ${roleName} YES`);
return true;
}
if ('http://schemas.microsoft.com/ws/2008/06/identity/claims/role' in claims
&& claims['http://schemas.microsoft.com/ws/2008/06/identity/claims/role'].indexOf(roleName) !== -1
) {
console.warn('Role claim type is ...microsoft...!');
return true;
}
return false;
}
));
}
The message AuthService.isInRole.pipe never appears.
The BehaviourSubject was supposed to give its latest value when referenced, but this is not happening. Why?