Cannot specify a column width on data type xml.

I copied a single xml parameter (@xmlone) into three total, and now I get this error.

This code worked fine in Visual Studio and Xamarin, but complains in unity.

Column, parameter, or variable #4: Cannot specify a column width on data type xml.
UnityEngine.Debug:Log(Object)
inventory:reserve_id(Int32, String, String) (at Assets/scripts/inventory.cs:603)

	public  void reserve_id(int unique_id, string un, string pw)
	{
		Debug.Log("reserving ID...." + unique_id + " " + un + " " + pw);
		//tmp_username = un;
		//tmp_password = pw;
		//tmp_id = unique_id.ToString();

		tmp_username = un;
		tmp_password = pw;
		tmp_id = "16";

		string InsertString = "INSERT INTO  VALUES(@unique_id, @username, @password, @xmlone, @xmltwo, @xmlthree)"; //@xmltwo, @xmlthree
		//Debug.Log(" " + InsertString);
		using (SqlConnection sql_connection_a = new SqlConnection( GetConnectionString() ) )
		{
			sql_connection_a.Open();
			
			using (SqlCommand command = new SqlCommand(InsertString))
			{
				command.Connection = sql_connection_a;
				
				command.Parameters.Add("@unique_id", SqlDbType.Int, 5).Value = tmp_id;
				command.Parameters.Add("@username", SqlDbType.VarChar, 20).Value = tmp_username;
				command.Parameters.Add("@password", SqlDbType.VarChar, 20).Value = tmp_password;
				command.Parameters.Add("@xmlone", SqlDbType.Xml).Value = create_XML(tmp_username).ToString(); //###
				command.Parameters.Add("@xmltwo", SqlDbType.Xml).Value = create_XML(tmp_username).ToString(); //###
				command.Parameters.Add("@xmlthree", SqlDbType.Xml).Value = create_XML(tmp_username).ToString(); //###
				try
				{
					var result = command.ExecuteNonQuery();
					Debug.Log("ID RESERVED SUCCESS");
					Debug.Log(result.ToString());
				}
				catch(SqlException e)
				{
					Debug.Log("ID RESERVE FAILED");
					Debug.Log(e.ErrorCode);
					Debug.Log(e.Errors);
					Debug.Log(e.Message);
				}
				finally
				{
				}
			}
		}	
	}

Well, not much of an answer, but a solution for the time being. I changed the SqlDbType to be NVarChar in the parameter… it doesn’t complain for now.

    command.Parameters.Add("@xmlone", SqlDbType.NVarChar).Value = create_XML(tmp_username).ToString(); //###