'backspace' not accepted as key in online experiment

OS :Win10
PsychoPy version : 2024.2.4 Py 3.8
Standard Standalone Installation? (y/n) y
URL of experiment: retrieval_online [PsychoPy]
Do you want it to also run locally? n
What are you trying to achieve?:

I have a task where participant have to place images in a memory arena. They select an image, drag it to a position and then press “Enter” to confirm its position. If they want to deselect the figure, they press “backspace”, a feedback message appears and the image is deselected. This runs smoothly locally. I did some adjustments to make it work online and nafter few attempts at least it works.

However, while the key “Enter” works well (the position of the image becomes fixed and is not movable anymore), the key “backspace” does not work at all: the image is not deselected and no feedback message appears. This make me think tath the key “backspace” is not accepted for some reasons… do you have any ideas on how to fix this?

The repository is public (Isotta Rigoni / test_visual_memory_online · GitLab) and here is a snippet of the “each frame” code I use to get the keys:

Dear Irio,

Try looking at the solutions here to fix it?

Issac