Multiple Api Calls with Promise.all does return undefined

Question

I have an array of marinas, for which I want to make api calls. The Problem is that the result will arrive after, the return. Can anyone help me please?

 getAllChangeRequests(): Observable<any> {
        console.log('getAllChangeRequests');

        this.changeRequestArray = []
        this.state.setUpdating(true);

        return this.userOrganisationFavouritesFacade.loadAll().pipe(map(async marinas => {
            const promises: U2bChangeRequest[][] = []

            const test = await Promise.all(marinas.map(marina => {
                if (marina.organisation?.bcm_tenant_id) {
                    console.log('hallo2');

                    this.getMany((new HttpParams().set('tenantId', `${marina.organisation?.bcm_tenant_id}`))).subscribe(changeRequests => {
                        console.log(changeRequests);

                        promises.push(changeRequests)
                    })

                }
            }))

            console.log(test);
            
           


            this.state.setChangeRequests(this.changeRequestArray);
            this.state.setUpdating(false);

            return promises;


        }));


    }