Can someone explain to me why this code makes an API call twice? I'm using Angular 21 with SSR activated.

ngOnInit(): void {
  if (this.appService.platform() === 'browser') {
    const { confirmationToken } = this.activatedRoute.snapshot.params;

    console.log('CALL NOW');

    this.authService.registerConfirm(confirmationToken).subscribe({
      complete: () => {
        console.log('ENTER COMPLETE');
        this.onRegisterConfirm.set('success');
         setTimeout(() => {
          console.log('REDIRECT');
          window.location.href = window.location.origin;
         }, 3000);
      },
      error: (error) => {
        console.log(error);
        console.log('ENTER ERROR');
        this.onRegisterConfirm.set('error');
      },
    });
  }
}