CreateDocumentFromTemplate CSOM methods does not seem to work

I've been trying to create documents from template in SharePoint Online using methods that were added in a more recent update of CSOM. However I can't get it to work. All methods fails in different ways. Is there a working example?

// TODO: Assign the following strings
//private static string Username = "";
//private static string Password = "";
//private static string WebUrl = "";
//private static string TemplateFileUrl = "";

private static void Main(string[] args)
{
    var password = new SecureString();
    foreach (var c in Password) password.AppendChar(c);

    var credentials = new SharePointOnlineCredentials(Username, password);
    var clientContext = new ClientContext(WebUrl)
    {
        Credentials = credentials
    };

    using (clientContext)
    {
        Console.WriteLine("CreateDocument");

        try
        {
            CreateDocument(clientContext);
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message); // Creates empty file
            throw;
        }

        Console.WriteLine("CreateDocumentFromTemplate");

        try
        {
            CreateDocumentFromTemplate(clientContext);
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message); // Creates invalid file. Word say "There was a problem with its contents"
            throw;
        }

        Console.WriteLine("CreateDocumentFromTemplateStream");

        try
        {
            CreateDocumentFromTemplateStream(clientContext); // Creates invalid file. Word say "There was a problem with its contents"
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
            throw;
        }

        Console.WriteLine("CreateDocumentFromTemplateBytes");

        try
        {
            CreateDocumentFromTemplateBytes(clientContext);
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message); // Throws "Unknown error"
        }

        Console.ReadLine();
    }
}

private static void CreateDocument(ClientContext clientContext)
{
    var documents = clientContext.Web.DefaultDocumentLibrary();
    clientContext.Load(documents);
    clientContext.ExecuteQuery();

    var document = documents.CreateDocument($"{DateTime.Now.Ticks.ToString()}.docx", documents.RootFolder, DocumentTemplateType.Word);
    clientContext.ExecuteQuery();
}

private static void CreateDocumentFromTemplate(ClientContext clientContext)
{
    var documents = clientContext.Web.DefaultDocumentLibrary();
    clientContext.Load(documents);
    clientContext.ExecuteQuery();

    var document = documents.CreateDocumentFromTemplate($"{DateTime.Now.Ticks.ToString()}.docx", documents.RootFolder, TemplateFileUrl);
    clientContext.ExecuteQuery();
}

private static void CreateDocumentFromTemplateStream(ClientContext clientContext)
{
    var template = clientContext.Web.GetFileByUrl(TemplateFileUrl);
    clientContext.Load(template);
    clientContext.Load(template, t => t.ListId);
    clientContext.ExecuteQuery();

    var documents = clientContext.Web.Lists.GetById(template.ListId);
    clientContext.Load(documents);
    clientContext.ExecuteQuery();

    var stream = template.OpenBinaryStream();
    clientContext.ExecuteQuery();

    var document = documents.CreateDocumentFromTemplateStream($"{DateTime.Now.Ticks.ToString()}.docx", documents.RootFolder, "docx", stream.Value);
    clientContext.Load(document);
    clientContext.ExecuteQuery();
}

private static void CreateDocumentFromTemplateBytes(ClientContext clientContext)
{
    var template = clientContext.Web.GetFileByUrl(TemplateFileUrl);
    clientContext.Load(template);
    clientContext.Load(template, t => t.ListId);
    clientContext.ExecuteQuery();

    var documents = clientContext.Web.Lists.GetById(template.ListId);
    clientContext.Load(documents);
    clientContext.ExecuteQuery();

    var stream = template.OpenBinaryStream();
    clientContext.ExecuteQuery();

    byte[] bytesarray = null;

    using (var mStream = new System.IO.MemoryStream())
    {
        if (stream != null)
        {
            stream.Value.CopyTo(mStream);
            bytesarray = mStream.ToArray();
        }

        var document = documents.CreateDocumentFromTemplateBytes($"{DateTime.Now.Ticks.ToString()}", documents.RootFolder, bytesarray, "dotx");
        clientContext.ExecuteQuery();
    }
}