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Stuck at "CONNECTING" (in FPS demo)

I am trying out SpatialOS in Unity today. Everything downloaded freshly, and using the latest version of macOS (10.15.6), I worked my way through most of the FPS tutorial. All seemed to go smoothly, until the point where I launch the client, and am meant to connect and start playing.

When I press the spacebar to connect, it starts flashing the word “CONNECTING…”, and never connects. It’s been sitting there for over 10 minutes now. I did stop it and launch it again, with the exact same behavior.

So clearly it’s failing to connect to the server. How do I go about debugging this?

EDIT: I dug up the Unity player log, and it appears to be stuck on:

[UnityClient] Waiting for required worker flags…