EWS Manage Api Exchange Online TokenCredentials always returning 401

Hi,

Im trying to get acces to Exchange Online with the EWS manage api 2.2 and Im trying using this

       ExchangeService service = new ExchangeService();
            service.TraceEnabled = true;

            service.Url = new Uri("https://outlook.office365.com/EWS/Exchange.asmx");
            //service.HttpHeaders.Add("Authorization", "Bearer " + token);
            service.Credentials = new TokenCredentials(token);
            //service.PreAuthenticate = true;
            //service.SendClientLatencies = true;
            //service.EnableScpLookup = false;

Always I get 401 unauthorized the token I get Azure Ad Authentication library , with this code

   var authenticationContext = new AuthenticationContext(_config.AuthString, false);
            // Config for OAuth client credentials
            var clientCred = new ClientCredential(_config.ClientId, _config.ClientSecret);
            AuthenticationResult authenticationResult = authenticationContext.AcquireToken(_config.ResourceUrl,clientCred);
            string token = authenticationResult.AccessToken;

The app is registered on Azure Ad and have all the permision ,

Im missing something? There is somewhere  a working example?

I thinks is the same problem that is explained  here

Live like you'll die tomorrow, learn like you'll live forever. Blog