Configuring preferences and options in Outlook.com
I have the same issue and gave up. Applaud your perseverance, but in early 2025, it seems Microsoft has still not fixed this issue. When I try to open the .ics file with new outlook, I simply get, "The new outlook for windows doesn't currently support this action. You can switch back to Classic Outlook for Windows and try again." I've been using new outlook for over a year...pretty sad this basic functionality still requires you navigate back to old Outlook. And I also have the same issue when I go back to classic...it's like I stepped back in time. It makes the switch pretty painful, so I just deal with the lack of .ics import functionality.