Method to update Power BI embed token for dashboard.

updateToken.ts

updateToken() {
  // Generate new EmbedToken
  this.service.getDashboardEmbedToken()
    .subscribe((res) => {
      let Token = res.json();

      // Get a reference to the embedded report HTML element
      var embedDashboard = <HTMLElement>document.getElementById(
        'embedDashboard'
      );

      // Get a reference to the embedded report.
      var report = this.powerbi.get(embedDashboard);

      // Set AccessToken
      report.setAccessToken(Token.token)
        .then(()=>{
          // Set token expiration listener
          // result.expiration is in ISO format
          this.setTokenExpirationListener(Token.expiration, 2 /*minutes before expiration*/);
        });
    });
}