Cannot type square brackets in python lessons

This lesson at point 2

Hello, I am not able to write square brackets in Codeacademy. I can write them regularly everywhere else, but not when using Codeacademy.

I tried the Alt Key Combination, didnt work.
I tried changing my Keyboard layout to American Qwertz and Qwerty, didnt work.

Using the virtual keyboard works, but would be quite annoying to get the program out of the background, click it, and then minimize it again because I dont want to have the keyboard obscuring my screen.

Does anyone have an idea how I could solve this? I had a similar problem a few months back I think with curly brackets, dont remember which lesson tho. Just tested it, curly brackets also dont work.

Thanks in advance for any help!