To answer your question (maybe), no the IKEA buttons are not compatible with Hubitat.
Edit: IKEA released new firmware and the devices are compatible after updating.
Some sort of work but they intermittently burn through batteries.
Others don't work at all.
So it's best just to avoid them to begin with. 
I've had good luck with the Sonoff buttons you can pick them up for around CDN$10 sometimes on amazon.ca and regularly on Aliexpress.
