HomeKit bridge home assistant not reachable from outside

Hello everyone, I have a problem with the Home Assistant HomeKit bridge. When I am connected to the home wifi with my iPhone I can easily control everything, while as soon as I leave the house and use the phone connection all the devices stop responding and become unavailable. I specify that my HA can be reached from the outside with a domain and has https. Thanks in advance for your help.

Hello everyone, in the end looking on the web I saw that it is necessary to have a hub to make the home assistant homekit brdidge work even remotely. Does it have to be an Apple TV or a HomePod or can I also use the same home assistant? Please answer me that I am desperate. Thank you.

Could anyone help me please?

No one could help please? I need that information…