Hi Aleksandr,
In my experience there's has been a long standing, fairly
consistent bug in the Gemini where the "hot spot"
functionality will act as if it's working, but anything
that connects to Gemini cannot get to the Internet.
I've found that if you reboot the Gemini and immediately
afterwards start the hot spot, then any allowed devices
will then be able to get to the internet.
Good luck,
PJS