I was running a Homey Early 2019 (regular version) for a few weeks as test, started with 3.0.0, found the Connect Life360 app and worked perfect. Even after updating to 3.1.0.
Returned the Homey (regular) and bought a Homey Pro. After first setup it was immediately updated to 3.1.0. I found and installed all apps I had on the regular Homey , but can not find your Connect Life360 app anymore in the Homey apps. Could you (or anyone else) shed your bright light on this maybe please ?
Update : when searching “Connect Life360” through the Homey DEVICES (instead of going through Apps) I found it, but when installing it shows the message "An unknown error has occurred [build_not_found] (red banner coming down from top with the message in white)