Error message saying that my ID or password is incorrect when trying to apply iCloud for W settings for Outlook

Why, when from my PC I try to apply iCloud for Windows app settings to sync my calendar in Outlook, do I get an error message saying that my ID or password is incorrect. I'm successfully in the app and Outlook is working fine for email sync. It appears that the error message is from Outlook, but the error message prevents even saving the app settings. Very odd.