Microsoft Graph API token validation failure

I would use Microsoft Graph API in my Angular Web application.

First I make connexion using msal library When I try log in with my profil I get this error

I have configured my app as the mentionned in the official git sample

MsalModule.forRoot({
  clientID: "Tenant ID",
  authority: "https://login.microsoftonline.com/common/",
  redirectUri: "http://localhost:4200/",
  validateAuthority : true,
  popUp: true
}),

Authetification is working and I get the token.

Then when I'm in home page I make a second request to Microsoft Graph API to get user information using that token.

getProfile() {
  let header= new Headers();
  let tokenid= sessionStorage.getItem('msal.idtoken'); 
  header.set('Authorization', 'Bearer ' + tokenid)
  let url ="https://graph.microsoft.com/v1.0/me/"
  return this.http.get(url,{headers:header});
}

}

I get an 401 Unauthorized error with a response :

{
  "error": {
    "code": "InvalidAuthenticationToken",
    "message": "Access token validation failure.",
    "innerError": {
      "request-id": "xxxxxx",
      "date": "2018-10-09T22:58:41"
    }
  }
}

I don't know why MG API is not accepting my token, Am I using wrong authority url ?

UPDATE: I have understood that actually I get id_token which is different from access token. How can I get Access token from MSAL library to make MS GRAPH API calls ?:

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