Briefly change the campaign Server Type from Cloud to LAN. This will allow you to start your campaign and do your prep. You can change it back to Cloud when you're ready to play.
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@QuantumSim,
Can you open a command prompt on your computer; and run a command ("ping lobby.fantasygrounds.com") and let us know the results?
Also, make sure to check your Windows Defender (and any other security software installed) to make sure that FantasyGrounds.exe is specifically allowed to access the Internet.
Regards,
JPG