Page refresh wipes token

In my Angular SPA, I am able to successfully get the accessToken when a user logs in, but when I refresh the page, I lose the token and the claims. In my Okta options, I have

tokenManager: {session: 'sessionStorage'}

and in my showLogin() method, I have

this.oktaSignIn.tokenManager.add('accessToken', response[1]);

and in my ngOnInit() method, I have

ngOnInit() {
    this.oktaSignIn.session.get((response) => {
      if (response.status !== 'INACTIVE') {
        this.user = response.login;
      } else {

but still on a page refresh, the claims/accessToken is lost. Is my configuration wrong or is it something completely different?