Keymapping error "Unsupported key: Unknown" \ < > ( Blender 290 mac )

Hi all,
i am curious and a bit lost with this error " Unsupported key: Unknown"

When i try to add as a shortcut < or \ the console print an error “Unsupported key”
But how can be unsupported when i can use it in the script editor? XD
I am confused

Its a blender Problem?
Its a keyboard Problem?
Its a mac Problem ?
can i solve it in any way?

thanks for your time!