Players connecting to different room. (PunBasics Demo)

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Hey,

I am new to Photon pun. I just downloaded their SDK and trying out my luck on their demos provided with the Unity package.
I am currently running their punBasics demo.
When I run 2 instance of build on same computer , both the players are connected in to single room,
but when I run 1 instance on Mac and other on Windows, both gets connect to different rooms.

How can I make them connect to same room?

I have tried to make custom room, with properties as room.isVisible set to true.

Thank You.

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