Dr. TOH and I used the kiosks at Miami last week. The fingerprint scanner would only register four out of five prints, again and again and again and again.
As we were on a tight connection, we were getting irritated. The guy helping people explained that you had to keep your fingers together instead of splaying them out slightly.
Sure enough, this worked. I commented that it might have been a good idea for the machine to tell people this..
“Tell me about it,” he said with feeling. “We’ve asked them to modify the instructions again and again, but they don’t.”