Hi,
I have resolved this issue. I was using the WebIDE chrome plugin from Brave Browser which uses Chromium, but it seems does not work properly in this case. I can proceed using Chrome browser.
Might be worth noting by the Espruino team though.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
No need for this, use only the WebIDE for connecting.