Upgrade To Catalina, Opening Excel File With Numbers, Formulas Not Working ? I have Upgraded to Catalina and opening excel file with numbers (as excel is not working now in Catalina OS), i see now that the formulas of that excel file are not working.(This feature requires that the Mac dates from mid-2013 or later, that all devices use the same iCloud account and that the Apple ID uses two-factor authentication instead of two-step verification.) Going forward when your Mac or an app wants your password, your Apple Watch will provide it automatically.