Spreadsheet Data Formatting Not Working

I have a function to generate a single worksheet in an excel xlsx workbook. I am passing in a sheet name, a comma separated list of column names and a query of data.  No matter what I do, I can’t seem to get a data format to be applied to a cell. I have seen a few examples and it’s using similar methodology, which leaves me scratching my head.

Is there a sequence that must be followed for the formatting to be applied?

Do I need to write the file and then update it with the formatting?

// Create a spreadsheet object with the sheetname passed into the function.
variables.spreadsheetObj = spreadsheetNew(“#ARGUMENTS.sheetName#”,true);

//Add the header row column labels
spreadSheetAddRow(variables.spreadsheetObj, “#ARGUMENTS.columnNames#”);

//Format the header row
SpreadsheetFormatCellRange(variables.spreadsheetObj, variables.headerFormat, 1, 1, 1, #variables.numberOfColumns#);

//Add the data from the query
spreadsheetAddRows(variables.spreadsheetObj,variables.dataQueryResults,2,1,false,[“”],false);

//Format the data rows with the formatting from above, and apply to the rest of the rows.
spreadsheetFormatRows(variables.spreadsheetObj,variables.rowFormat,”2-#variables.lastExcelRow#”);

//Set the values of a format struct
variables.cellFormat = StructNew();
variables.cellFormat.dataformat = “($#,##0_($#,##0)”;

//I Loop through a comma separated list of the columns that need formatting and run this function
spreadsheetFormatCellRange(variables.spreadsheetObj, variables.cellFormat, 2, #columnNumber#, 21, #columnNumber#);

//Write the excel file.

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