What could have happened?

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I'm learning and made a simple project on 3/15. It instantiates a cube as a player after connecting to room. It worked and every new instance of the .exe I launch, I see another cube.

Having learned it, I went to integrate PUN2 to my actual game. It also worked but a few days ago, all of a sudden I don't see other players any more. Debugging shows every instance thinks itself as the master client.

After not making progress debugging further the past few days, I remembered the sample project's exe I built 3/15. So I go back to launch it and it also doesn't show other players any more.

The last modifed date of this .exe is 3/15, meaning I didn't change anything to cause this behavior. Could my account have somehow changed?

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