It's a rough start, with the game and with the company (the day Larian studios was going to deliver the game, the day electricity went out).
So here is the fix for those that has Steam application.
Start the game manually from the directory, and the application works as normal as it can get.
The only problem is the global chat, but that can be because it just does not work at the moment (as in I don't know if it's a local problem or a global one).
Further help, the app is in (not an actual variable, just visually showing):
%steamcatalog%\steamapps\common\Divinity Original Sin 2\bin\EoCApp.exe
