Template doesn't recognize nested list

[kyo1506]

I'm attempting to incorporate a nested list into my template, but it seems to be unable to recognize even the first level of nesting. Despite my thorough examination and repeated review of the documentation, I haven’t been successful. Could anyone lend a hand? I’ve included my template, code, and the resulting issue below for reference. I appreciate your help in advance!

`

        var httpClient = _httpClientFactory.CreateClient("Anonymous");

        using Stream calibri = await httpClient.GetStreamAsync("templates/calibri.ttf");
        using Stream arial = await httpClient.GetStreamAsync("templates/arial.ttf");

        LoadOptions.DefaultGraphicEngine = DefaultGraphicEngine.CreateOnlyWithFonts(
            calibri,
            arial
        );

        using var streamTemplate = await httpClient.GetStreamAsync(
            "templates/CustomerReportTemplate.xlsx"
        );

        using var template = new XLTemplate(streamTemplate);

        template.AddVariable("Customers", result?.Data);
        template.Generate();
        template.Workbook.Worksheets
            .Worksheet(template.Workbook.Worksheets.First().Name)
            .ColumnsUsed()
            .AdjustToContents();

        using var memoryStream = new MemoryStream();

        template.SaveAs(memoryStream);

        return memoryStream.ToArray();

`
CustomerReportTemplate.xlsx