Following the PUN tutorial, never finds an open room

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Hello.
I've been following the PUN tutorial step by step, but found a problem at the end of the Tutorial 4.

I am told to run both a Desktop version and the Unity version to try and see if both get connected to the same room. No matter what I do, they both always create their own room, saying that they cannot find a room.

I'm going to post the Logs of the Unity version to see if you can help me in any way.
https://imgur.com/a/PdOSL
Below that it only says that "We load the Room for 1", and a couple of return codes.

Thanks in advance.

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