Yes PIN is the regular pin you enter into Jablotron keyboard. You can leave it empty but then you have to enter it everytime you arm/disarm.
To you problem. I have no idea what is “unable to activate the component”. Never seen such message. Where do you see it?
I see it, whenever I try to activate the alarm system …
Update: There is a “funny” behaving … when I activate the alarm system from my standard panel, immediately I can see it on home assistant that it is activated. I can also deactivate the system from home assistant but when I try to activate it I get this error message as pop-up in hass on the bottom of the screen.
Feel free to report it as issu to the integration with screenshots and debug logs.