I assume you are seeing the IVS events in the camera its self. Try enable the smart motion detection and see if those ONVIF events get through to BI and trigger it.
Does you camera report "GetEvents: ok" as below on the camera setting > general tab?
Have you disabled ONVIF authentication in the camera? Network > Access Platform > ONVIF
You also have the enabled checkbox option. Guessing you are running BI 5.7.5.3? It might have changed between versions or I modified it. I don't remember touching it though. Most of my triggers are "intrusions".
If you change it to match mine do they work?
Correct, that is for intrusion events. My tripwire events are also working. Screen shot of that rule attached. I can't remember if that's a default rule or I modified it though sorry.
This might also be relevant. In my IVS rule config:
Tripwire, I have target filters turned off and direction...
I have a 5442T-ZE (firmware: V2.840.15OG00D.0.R, Build Date: 2022-08-18) and stopped getting IVS triggers with BI 5.7.5.2 too. I was able to get it triggering again by adding a new basic ONVIF trigger to the list (screen shot of the ONVIF rule attached). It's probably a bit of a hack but gets it...