encrypt=strict key did not work with System.Data.SqlClient to established TLS 1.3 connection

Question

I want to establish TLS1.3 Protocol communication between System.Data.SqlClient and SQL Server 2022.

As per Microsoft TDS8, we need to add Encrypt=strict key in the connection string to established TLS 1.3 connection. But when I added this key below error thrown

Invalid value for key 'encrypt'

When I keep encrypt=true then a TLS 1.2 connection is established. (proper certificate I am using).

Looks like encrypt takes only true/false values only. No strict/optional/mandatory even though MS suggested it.

Sample code:

using System.Data.SqlClient;

namespace SQLClient
{
    internal class Program
    {
        //sql conn string
        static string sConnStringRemoteSql2k22 = "Encrypt=Strict;Password=Password@123;Persist Security Info=True;User ID=sa;Initial Catalog=Testdb;Data Source=sql2k22.test.com;Application Name=test";
        
        static void Main(string[] args)
        {
            SqlConnection conn = new SqlConnection(sConnStringRemoteSql2k22);

            try
            {
                string query = "Select * from Players";
                conn.Open();

                SqlCommand cmd = new SqlCommand(query, conn);

                using (SqlDataReader dr = cmd.ExecuteReader())
                {
                    while (dr.Read())
                    {
                        Console.WriteLine(dr["Name"].ToString() + " " + dr["dept"].ToString());
                    }
                }
            }
            finally
            {
                conn.Close();
            }

            Console.ReadLine();
        }
    }
}

Environment:

• Microsoft SQL Server 2022 (RTM-CU10) (KB5031778) - 16.0.4095.4 (X64) Express Edition (64-bit) on Windows Server 2022 Standard 10.0 (Build 20348: ) (Hypervisor)

• .NET Framework 4.8.1

• System.Data version 4.0.0.0

• OS: Windows Server 2022

Why does encrypt=strict not work with SqlClient? Or is there any key I need to add to an established TLS 1.3 connection?