FaceTime on Mac

See: https://support.apple.com/en-ca/HT208176

“Use Group FaceTime

If you're using macOS Mojave 10.14.3 (build 18D109) or later, you can use Group FaceTime to chat with up to 32 people. Each person's tile automatically increases in size whenever someone speaks.

FaceTime shows up to 4 or 9 live video tiles at the same time, depending on your Mac model. These tiles represent the most active speakers. Other participants show an exclamation point.”

I have the macOs High Sierra version 10.13.6, and I recently installed the update. I am able to connect with one individual but not in a group setting. I am in a message group of 5 and I can see the text messages but not the join FaceTime option. On the other hand my iPhone and iPad are able to receive group FaceTime messages. I checked the settings and everything is enabled on the Mac book to receive group FaceTime. Thoughts>