Hi Adam,
Sorry to hear you are having issue to connect. This error generally suggests there may be some type of networking issue preventing the desktop app from connecting to our web servers.
To clear this issue, we recommend that you reach out to your IT services team or network admins to see if there have been any network security settings have changed recently. They may also need to make sure that *. figma.com is added to any ‘safe lists’ (=> VPN/Proxy/Firewall or antivirus allow lists) and to unblock Port 443 and enable WASM as needed.
You can also find these requirements in Adjust your network settings, Troubleshooting checklist
As reminder, our supported browsers are Chrome, Firefox, Safari and Edge.
If the issue is specific to the app, you may want to try clearing the app cache (Help > Troubleshooting > Clear Cache and Restart).
Hope this helps! If not, I suggest you to reach out to the support team as mentioned in your screenshot so they can have a deeper look at it: here