How to map a Id propertie with existing GUID in BsonClassMap with C# in MongoDb

Question

try to map the id property from a derived class with a given GUID with BsonClassMap.RegisterClassMap() method.

 public class SensorDefinition : IEntity, IAggregateRoot
    {
        public SensorDefinitionId Id { get; }
        private string _name;
        private string _description;
        private string _version;
        private int _numberChannels;
} 

public class SensorDefinitionId : TypedIdValueBase
    {
        public SensorDefinitionId(Guid value) : base(value)
        {
        }
    }



 public abstract class TypedIdValueBase : IEquatable<TypedIdValueBase>
    {
        public Guid Value { get; }

        protected TypedIdValueBase(Guid value)
        {
            if (value == Guid.Empty)
            {
                throw new InvalidOperationException("Id value cannot be empty!");
            }

            Value = value;
        }

And the mapping class:

  BsonClassMap.RegisterClassMap<SensorDefinition>(map =>
            {
                //map.AutoMap();
                map.MapField("_name").SetElementName("Name");
                map.MapField("_description").SetElementName("Description");
                map.MapField("_version").SetElementName("Version");
                map.MapField("_numberChannels").SetElementName("NumberChannels");
                map.MapIdProperty(_ => _.Id).SetElementName("Id");
            });

The problem: in the database there is no guid value in the ID.

How does it look like the correct map code for the id? thx.