Alarm state_changed attribute always null

Hi everyone!

I’m setting up our home alarm system using the Manual Alarm Control Panel. All the automations are done in Node-Red for what it’s worth. I am sending a notification when the alarm is set, triggered etc., what I have not been able to find how to do is get the entity/user that caused the state change. I see on the alarm entity in the Logbook it shows the user who set/disarmed the alarm but haven’t been able to find where I can access this for an automation. Within the alarm entity attributes there is an attribute state_changed but this is always null it seems.

Anyone know how to solve this?

Many thanks!

Will