https://arstechnica.com/gadgets/2020/04/apple-releases-watchos-and-macos-updates-to-fix-facetime-issue-plus-other-bugs/

Earlier this week, Apple released updates for iPadOS and iOS to fix a bug that prevented devices running the latest software from joining FaceTime calls with some older devices. Now, Apple has done the same with macOS and watchOS, but the macOS update includes a few additional fixes, too.