Generally, we follow MS Excel standards and specifications for Excel file formats. So if the generated file does not work in Ms Excel (2007 - 2019) or gives some issue in it, we fix the issue as soon as possible. Excel 365 is just a subset of MS Excel, Excel 365 may have some limitations and other differences. I simply opened your .XLSM file into MS Excel (2013, 2010 and 2007), it works fine, see the screenshot attached.
sc_shot1.png (40.9 KB)
How did you create the file, could you share the sample code (runnable), we will check it further by evaluating older and newer versions of Aspose.Cells and test the output into Office 365 as well.