Apple just released iOS 1
The good news is that you don't have to worry about this error right now. Apple says it is permanently disabled group FaceTime on iOS 12.1.3 and macOS 10.14.2, as well as older versions of the software.
The bad news was that you couldn't use Group FaceTime for more than a week while Apple was working on the fix. As Apple's system status page points out, the FaceTime servers group is back online and you can make FaceTime calls again, but only after you have updated.
To update an iPhone or iPad, go to Settings> General> Software Update on iPhone or iPad and install the update. On a Mac, go to the Apple menu> System Preferences> Software Update.
After installing the update, you can feel safe activating FaceTime on iPhone, iPad or Mac.
On an iPhone or iPad, go to Settings> FaceTime and change FaceTime. On a Mac, start FaceTime and select FaceTime> Turn on FaceTime On.
You must repeat this step on every iPhone, iPad and Mac you own. The option is controlled separately for each device.
This bug fix was originally intended to arrive last week, but Apple delayed it. Now it's finally here. This delay did not endanger anyone because Apple had already pulled down the FaceTime servers in the group, but now iPhone, iPad and Mac users can again use the FaceTime group.
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