I'm also getting an issue here. Web app works as expected, but the mac app doesn't sync (and new documents from web aren't reflected in the Mac app).
I'm definitely connected to the internet (in the US, no vpn or proxy stuff), but the debug console of the app shows
OFFLINE ENABLED. There's also
debugging.ts:60 Error: Uncaught TypeError: Cannot read property 'get_server_id' of undefined, which feels related.