Scheduling and managing events using Outlook.com calendar
I’ve also contacted both Apple and Microsoft and each one blames the other. I’ve tried going back to an earlier version of iCloud, which of course doesn’t work. I’ve also tried uninstalling the latest Windows 10 security updates and that did nothing either. I also did a system restore on one of my machines from about a month ago and for some reason that didn’t work either. That machine was working fine I month ago and as soon as I booted up and launched iCloud settings the same problem cropped up.
In that case it's probably both their fault. They're simultaneously both wrong, and both right. That doesn't bode well, because it means they'll have to communicate with one another to fix it.