GraphAPIAuthTest.cs

using System;
using Azure.Identity;

namespace graphapitest
{
    class Program
    {
        static void Main(string[] args)
        {
            var cred = new DefaultAzureCredential(new DefaultAzureCredentialOptions() { SharedTokenCacheUsername = "email@email.com" });
            var t = cred.GetToken(new Azure.Core.TokenRequestContext(new[] { "https://graph.microsoft.com/.default" }));
        }
    }
}