I followed these instructions in Confluence and got a calendar url of
https://confluence.cms.gov/rest/calendar-services/1.0/calendar/export/subcalendar/[calendar ID redacted].ics?os_authType=basic&isSubscribe=true
Note that when I follow that URL in a browser, I get a .ics file that downloads, and when I open it in Mac OS Calendar app, it imports the events as expected. That URL requires authentication though - if I visit it from an Incognito window, it prompts for a login.
I copied that URL, and in Google Calendar, I went to "Add Other Calendars" > "From URL", and pasted in that URL. None of this Confluence calendar's events show up in Google Calendar, and there is no prompt in Google Calendar to enter a username or password. The added calendar is set to be shown in Google Calendar (the checkbox next to it in the list is checked).
Hello,
You might be affected by one of the issues described on the bottom of KB:
There is currently a known issue with Google Calendar where a calendar subscription can't be added, or does not display events CONFSERVER-53690
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