using Microsoft.Identity.Client;

using Microsoft.Rest.Azure.Authentication;

​

public static async Task<string> GetAccessTokenAsync(string clientId, string clientSecret, string tenantId)

{

    var authority = $"https://login.microsoftonline.com/{tenantId}";

    var clientApp = ConfidentialClientApplicationBuilder.Create(clientId)

                    .WithClientSecret(clientSecret)

                    .WithAuthority(new Uri(authority))

                    .Build();

​

    string[] scopes = new string[] { "https://management.azure.com/.default" };

    var result = await clientApp.AcquireTokenForClient(scopes).ExecuteAsync();

    return result.AccessToken;

}