A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
I've been up to date on both Office and Mac for several days. (The latest Office update was just this past week.) I created the new workbook as you suggested and didn't get the message. I looked at preferences and saw the difference:
Privacy & Security > Privacy > "Remove personal information . . ." check box. For others who read this: if you check this box and are using macros, you will get the alert. If you leave it unchecked, no alert. I'd leave it unchecked when developing a workbook on your own computer. If you share the workbook later, you will have to decide on the "remove personal information" option in Preferences.
Thanks for this suggestion and the lesson, Jim. It solved the problem.