It's very common that keys or the whole keyboard has failed on these old Amigas. Two Amiga 500s I've tried now have 2-3 keys dead. Would be nice to be able to remap them to other keys, as they can sometimes be quite important. Like the ESC key, if it's not working anymore, one could remap it to a much less used key.
Hope this is something that can be added, and is hopefully easy enough so it might be in an update in the near future. I could really use it, and I'm sure many others as well.