@icmike52 the calendar module processes ics files. nothing else.
as you’ve noted, what shows on your Google calendar display may have nothing to do with what data u can get from your combined ‘calendar’ sources.
the other note is that your browser on your PC gets your user credentials, and logs on as you. the pi does not, so each data source has to be public or specially private for the mm code to access it, or u have to provide credentials for many sources.