Just saw this topic. I'm using both Locative and HomeKit automations (both of which have a similar setup). Locative has a great tutorial here:
https://community.hubitat.com/t/locative-presence-app-for-ios-full-setup/132985
And here is a topic specific to using Home app automations. These have been bulletproof for me. There are a couple of links in that post to how to set it up. If you can't figure it out, I'd be happy to help out.
https://community.hubitat.com/t/arrive-home-iphone-presence/104581/5?u=diverrich
