Cant connect to remote database with maui app from mobile device

Question

I can't connect to my remote MySQL database with my MAUI application which I start from a mobile device. But when I debug the application with "Windows Machine" everything is fine.

Can anyone please help me? Here is my code:

using MySqlConnector;

namespace Tinder4Nerds.Models
{
    static class DatabaseModel
    {
        private static MySqlConnection connection = null;

        private static void ConnectToDatabase()
        {
            try
            {
                string dbServer = "MY IP";
                string dbName = "MY DB";
                string dbUser = "MY USER";
                string dbPassword = "MY PASSWORD";

                var builder = new MySqlConnectionStringBuilder
                {
                    Server = dbServer,
                    Database = dbName,
                    UserID = dbUser,
                    Password = dbPassword
                };

                connection = new MySqlConnection(builder.ConnectionString);
                connection.Open();
                if (connection == null)
                {
                    Console.WriteLine("Error");
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
        }

        public static bool VerifyLogin(string username, string password)
        {
            string pwd = string.Empty;
            if (connection == null)
            {
                ConnectToDatabase();
            }
            var command = connection.CreateCommand();
            command.CommandText = "SELECT password FROM user WHERE username = '" + username +     
                "';";
            var reader = command.ExecuteReader();

            while (reader.Read())
            {
                pwd = reader["password"].ToString();
                if(password == pwd)
                {
                    return true;
                } else
                {
                    return false;
                }
            }
            return false;
        }
    }
}

The connection to the remote MySQL server is unsecured (perhaps this may help)

Exception e Errormessage:

{MySqlConnector.MySqlException (0x80004005): SSL Authentication Error
 ---> System.Security.Authentication.AuthenticationException: Authentication failed, see inner exception.
 ---> Interop+AndroidCrypto+SslException: Exception of type 'Interop+AndroidCrypto+SslException' was thrown.

Both my Desktop PC and my mobile devices are on the same network. And when my mobile device isn't in my home network it's the same - doesn't work.

Perhaps someone has a hint for me

Thanks