Homekit doesn’t stop updating

problem solved.

After enabling iMac keychain all well.

I don't understand why do I need to add my iMac to activate HomeKit as it was enabled both in my iPhone and iPad.

Ps.

I have an iPad configured as a hub

both iPhone and iPad with the same Apple ID

inside my home with home WiFi it’s ok

outside with local phone supplier 4G - Not working.

After research : When I'm in my house with local wifi its OK.

The problem regards only when off the wifi.

please advise

thanks