I'm using macOS 10.12, a Google account with multiple calendars, and Apple Mail to send/receive email.

When I get invitations from people at work (mostly using Exchange), the emails have an .ics file attached. When I open these, Calendar will show this error:

The error says:

The URL https://apidata.googleusercontent.com/caldav/v2/user@example.com/user encountered HTTP error 404. Make sure the URL is correct.

My calendar settings are basically the default; I just selected a different default calendar. (It's not like Calendar will actually use it to create new events when I double-click .ics files, but that's a different issue altogether.)

I've already tried the steps outlined here:

… by removing the com.apple.iCal.plist setting and the folders ~/Library/Calendars/Calendar Cache, ~/Library/Calendars/Pending Events and ~/Library/Calendars/Incoming. I've also completely removed the Google account from macOS (under System Preferences » Internet Accounts) and set it up again.

Manually creating entries works fine, though.

In the Console, I see that this request is sent:

[com.apple.calendar.store.log.caldav.http] [PUT https://user@example.com@apidata.googleusercontent.com/caldav/v2/user@example.com/events/040000008200E00074C5B7101A82E00800000000E05A9DEFFB89D3010000000000000000100000000A23C4C41B14D1498935304A002C0654.ics]

Seems pretty normal to me. When I import the same .ics file in Google Calendar's Web view, it works fine as well.

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