Scheduling and managing events using Outlook.com calendar
Same issue for us - we were happily using the family calendar on Windows desktop (using Outlook client and native calendar app), Android and Amazon Alexa. This switch which Microsoft didn't tell us about has caused the calendar to be invisible on all apart from Android using outlook app.
It appears to be deliberate:
The key section is in the FAQs at the bottom:
"Can I see the Family group calendar in other applications?
No, the Family group calendar only appears in Outlook.com and Outlook mobile."
So, looks like the calendar can't be seen from Outlook app, or from Microsoft native calendar application.
I'm going to try the workaround of manual creating a shared family calendar, but this is very poor management Microsoft.
It just baffles me why other MS apps - like Win 10 Calendar and Outlook - don't support this stuff. Now, my Outlook and Win 10 calendars are useless because they do not show the other 50% of my activities that are in the family calendar.
Looks like we'll need to switch to Google Family Calendar or Apple's Family stuff. If we do that, then there's very little reason to maintain any Outlook.com/MS accounts. The only thing is XBOX, but maybe we'll go the Playstation route.