Windows 10: sync shared calendar via Google Calendar

I am using the Windows 10 calendar. It is conveniently there, and it seems to do an OK job. But it is not possible to add a shared calendar via a URL. The only options are international holiday calendars.

However, I also have a Google account added to the Windows 10 calendar/mail/contacts, so I decided to add the shared calendar there and sync it with Windows 10. However, it did not show up there.

It is straight forward to add a calendar in Google Calendar: settings -> add calendar: from URL. Paste the URL and the calendar is added. In Windows 10, it will not show up yet. The trick is to go to and select the new calendar there. It showed up almost instantly in the Windows 10 calendar.