Implementing vue.js router guards when user infos come from asynchronous function

I'm working on a Vue.js application and I need to implement router guards to limit access based on user role and prevent an unlogged user to access the application. The login process involves an external application (WSO2 Identity Server, specifically), and the user info retrieved are saved in a Vuex store. The problem is that the login function is asynchronous, therefore when the router guards are executed user infos aren't available yet. To make it work I called the login function inside an anonymous async function and I put the guards inside its then block. Since I didn't find examples of this approach on the internet, I would like to know if it is correct or there is a better way of handling this problem. Thank you all in advance.

Here's an example of my router code:

... router code

(async function() {
  // get user data and saves them in the vuex store
  await userService.initUserData();
})().then( function() {
    const isAuthenticated = store.getters.getIsAuthenticated;
    const userRole = store.getters.getUserRole;

    router.beforeEach((to, from, next) => {
      // check if user is logged in,
      // if not redirect to login page (LoginPage)
      if (to.name !== 'LoginPage' && !isAuthenticated) {
        next({ name: 'LoginPage' });
      } else {
        if (to.meta.customerAuth) {
          if (userRole === 'Customer') {
            next();
          } else if (userRole === 'Admin') {
            next({ name: 'AdminView' });
          } else {
            next({ name: 'LoginPage' });
          }
        } else if (to.meta.adminAuth) {
          if (userRole === 'Admin') {
            next();
          } else if (userRole === 'Customer') {
            next({ name: 'CustomerView' });
          } else {
            next({ name: 'LoginPage' });
          }
        }
      }
    })
  }
);