Nano Every not working with Create Chrome app

I have a Chromebook running ChromeOS 76.
Arduino Create app installed and working with a Uno board.
However, not with a Every board (an original from Arduino, not a copy).
The Every is viewable in chrome://devices-log, so the hardware is not the problem I guess.
In, the Every is not auto-detected. It is available in the "partially supported - verify only" list.
On the pages of ArduinoCreate and the OnlineIDE, it says that every board is fully supported out-of-the-box. But not so on Chromebooks?
Any ideas?