Convert ActivatedRoute.queryParams to Promise

I don't want to subscribe to route.queryParams as an Observable but want to make it a Promise to be able to use async/await to do various function calls in ngOnInit. Unfortunately I fail at this intention. The following implementation gives me no reaction or output:

constructor(private route: ActivatedRoute) { }

  async ngOnInit() {
    this.route.queryParams.toPromise().then(res => {

What am I doing wrong? Thx!

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