HeatIT Thermostat cant connect

Hi again.
Having some strage problems with HeatIT thermostat.
i linked it with almost no problems and installed the HeatIT handler. It shows up correct and works in IDE, but in apps on IOS and andoid is shows checking status all the time and when i click on it it says Cant connect, check the device.

Tried resetting everything few times no luck. No luck finding any solutions on google or here either.

Any suggestions?