Getting my presence group to work

Hello. Ultra HA Noob. I have created a new Sensor based on wifi SSID for 3 phones. That works ok. Swaps between home & not_home fine.

I’ve tried to then put those 3 sensors into a group so I can ascertain if home has anyone home but the group.resident just shows as unkown


The group is configured
name: “Residents”
- sensor.1_iphone_home
- sensor.2_iphone_home
- sensor.3_iphone_home
Can someone point me in the right direction please. I am following this article;