Homekit not working outside local network

Hello. I use Hass.io on my Synology NAS. Everythink working well instead homekit. I have tried to bridge devices from HA into Homekit using QR code of homebridge. It works and I can controll all bridget devices. But when I change network from local wifi to e.g. LTE. I see all bridget devices from HA as “Unavailable” but “native” homekit devices like as Elgato Eve works. What is a problem? Or how can I debug it. Thanks.