Development env variables arent changed with real values during deployment/production

I have an env .file

export const environment = { token: '123' };

and how i use it:

export class FlightSelectionService {
  // constructor
  constructor(private http: HttpClient) {}
  // env variables
  token = environment.token;
  headers = new HttpHeaders()
    .set('Accept', 'application/vnd.amadeus+json')
    .set('Authorization', `Bearer  ${this.token}`);
  // rxjs varibales
  responseData$: Observable<any> | undefined;
  loadData: boolean = false;

the real key is stored in env variables on netlify but it doesnt get changed. I set the value during deployment, but it doesnt work. Why?

Is there a site/URL we can check/reproduce the issue on?