Retrieve Groups From Microsoft Graph

example.cs

/*
  Uses Flurl.Http instead of default http client
  Your app registration will need the appropriate permissions for microsoft graph
  
  *** Additional exception handling needed if in a production scenario ***
*/

public static class Program
{
  public async Task Main()
  {
    var tenantId = "<insert tenant id>";
    var clientId = "<insert client id>";
    var oid = "<objectidentifier from claims>"; // this is the unique guid from microsoft
    var clientSecret = "<insert client secret>";
    var graphUrl = $"https://graph.microsoft.com/v1.0/users/${oid}/memberOf";

    var result = await $"https://login.microsoftonline.com/{tenantId}/oauth2/v2.0/token".PostUrlEncodedAsync(new
    {
      client_id = clientId,
      client_secret = clientSecret,
      scope = "https://graph.microsoft.com/.default",
      grant_type = "client_credentials"
    }).ReceiveJson<TokenResponse>();
    if(!string.IsNullOrWhiteSpace(result.access_token))
    {
      var groupResponse = await $"https://graph.microsoft.com/v1.0/users/{oid}/memberOf".WithHeader("Authorization", $"Bearer {result.access_token}").GetJsonAsync<GroupsResponse>();
      
      // WORK WITH GROUPS FROM HERE
    }
  }

  public class TokenResponse {
    public string token_type;
    public int expires_in;
    public int ext_expires_in;
    public string access_token;
  }

  public partial class GroupsResponse
  {
    public Uri OdataContext { get; set; }
    public List<Value> Value { get; set; }
  }

  public partial class Value
  {
    public Guid Id { get; set; }
    public string Description { get; set; }
    public string DisplayName { get; set; }
  }
}