Unity test for sha256oid

TestRegister.cs

using UnityEngine;
using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;

public class TestRegister : MonoBehaviour {
    public string test() {
        CspParameters cspParams = new CspParameters();
             
        cspParams.KeyContainerName = "ThisIsAKey";  // This is the key used to encrypt and decrypt can be anything.
        var provider = new RSACryptoServiceProvider(cspParams);
        // Check if _RegString exsists, if not create it with an encrypted value of -1
        byte[] tempencryptedBytes = provider.Encrypt(System.Text.Encoding.UTF8.GetBytes ("hello"), true);

        // Get the value stored in RegString and decrypt it using the key.
        string decrypted = System.Text.Encoding.UTF8.GetString(provider.Decrypt(tempencryptedBytes, true));

        string id = CryptoConfig.MapNameToOID("SHA256");
        // "2.16.840.1.101.3.4.2.1": this causes a complaint
        var signature = provider.SignData(tempencryptedBytes, id);
        string tempencryptionString = Convert.ToBase64String (signature);
        Console.Out.WriteLine(tempencryptionString);
        
        // this is fine in Unity. In console both are fine and output the same result
        var signature1 = provider.SignData(tempencryptedBytes, "SHA256");
        string tempencryptionString1 = Convert.ToBase64String (signature1);
        Console.Out.WriteLine(tempencryptionString1);

        return id;
    }

    void Start() {
        test();
    }
}