C# accessing properties belonging to instance which is of object? (i.e. Nullable) type

Here is info about our technical development environment :

• .NET 6

• C# 10

• GraphQL 7.1.1

• GraphQL.Client 5.1.0

• GraphQL.Client.Serializer.Newtonsoft 5.1.0

GraphQLRequest request = new GraphQLRequest
        {
            Query = @"
            mutation FaxReceiverInfo(
                        $_DateCreated: datetime,
                        $_FaxNumber: String,
                        $_FaxRecord: uniqueidentifier,
                        $_Reason: String
            )
            {
            insert_vw_EmailDeliveryRecordDetail_one
              ( 
                    object: {
                             DateCreated: $_DateCreated,
                             FaxNumber: $_FaxNumber,
                             FaxRecord: $_FaxRecord,
                             Reason: $_Reason
            }
            ) 
            {
                DateCreated
                FaxNumber
                FaxRecord
                Reason                  }
            }",
            OperationName = "FaxReceiverInfo",
            Variables = new
            {
                _DateCreated = DateTimeOffset.FromUnixTimeMilliseconds(metaData.TimeStamp).DateTime.ToString("dd-MMM-yyyy
 hh:mm:ss tt"),

                _FaxNumber = metaData.FaxNumber,
                _FaxRecord = metaData.FaxRecord,
                _Reason = metaData.Reason
            }
        };

Within the GraphQL 7.1.1 , the Variables of of type object?

namespace GraphQL;

/// <summary>
/// A GraphQL request
/// </summary>

 public class  GraphQLRequest : Dictionary<string, object>, IEquatable<GraphQLRequest?> {
      public const string VARIABLES_KEY = "variables";
      ……….Blah Blah Blah More Code……..
      /// <summary>
      /// Represents the request variables
      /// </summary>
      public object? Variables
      {
            get => TryGetValue(VARIABLES_KEY, out object value) ? value : null;
            set => this[VARIABLES_KEY] = value;
      }
        ……….Blah Blah Blah More Code……..
  }

In the client code that uses the aforementioned request of type GraphQLRequest, I’m trying to access the properties within the request.Variables member variable:

request.Variables……blahblah _DateCreated Blah blah

request.Variables……blahblah _FaxRecord Blah blah

Essentially, could someone please post back code that will properly access the properties within the request.Variables( which is of object? type) member variable?