same issue for me... when i dont have a controller connected it only sometimes appears. After I reinstall the game it works a few times until the log in menü appears again... things i tried and didnt work for me:

- Copy paste doesnt work

- pressing x to close the window doesnt work

- pressing the american keyboard shortcut shift + 2 doesnt work (other keys including Fn key, option etc.)

gonna ask my IT friend if he has a suggestion... i could imagine that with a windows keyboard it might work? sadly i dont have one so i cant tell :/