Group creation using Graph in Azure Function

using Microsoft.IdentityModel.Clients.ActiveDirectory;
using OfficeDevPnP.Core;
using OfficeDevPnP.Core.Framework.Graph;
using OfficeDevPnP.Core.Pages;

const string authString = "https://login.microsoftonline.com/<tenant domain>/";
const string clientId = "<Graph App ID>";
const string clientSecret = "<Graph App Secret>";
var authenticationContext = new AuthenticationContext(authString, false); 
ClientCredential clientCred = new ClientCredential(clientId, clientSecret);
AuthenticationResult authenticationResult = await authenticationContext.AcquireTokenAsync(resourceId, clientCred);
string token = authenticationResult.AccessToken;
var groupNew = UnifiedGroupsUtility.CreateUnifiedGroup(<projectUniqueAlias>, <SharePoint Site Title>,
                                                        <URL>, token, owners: <Owners email Array>, members: <Owners email Array>, 
                                                        groupLogo: <logo url>, isPrivate: <boolean>, retryCount: <numberofretries>);