Connection lost while moving around mesh to main router

Hi, I am testing home assistant for the first time, I have setup an instance on the Oracle VM box, and I have added devices to HA successfully.

When I load the app on my iPhone close to the mesh where the HA is installed the app works perfectly fine, as I move to the living room with the main router HA loses the connection. I have tried to read online and only found one solution which failed for me

I would really glad if someone can guide me to what might be the issue.