Hey Guys,
I have same issue.
Game was purchased and installed via steam client the normal way, but after it was downloaded it could not start at all. There was no error message, it just did not start. So I went to the hidden steam folder
D:\Games\Steam\steamapps\common\Baldurs Gate 3\bin and started the launcher exe from there just to test it. It worked but again of course the "no online community detected" ., it is a steam optimization issue. I have checked all files, disabled overlay under steam but it didn't work. I will try reinstall the game now and let you know if it works.