There were days of frustration last year when I couldn’t download apps via App Store on my iPhone. I sign out of my account and signed back in. I reset my iCloud account password. I refilled my Apple account with money too. But nothing worked. Then I realized my mistake. I had turned on Face ID for App Store and iTunes purchases. But why is that a mistake? After all, I have been using Face ID since 2018. I was using to unlock my phone and for other apps too. After researching online I found out I missed some finer points. It seems that I was supposed to double-click the side button on the confirmation screen but I was clicking the side button only once. Is it my mistake? Maybe, but what the screen told me via VoiceOver is “Confirm with Side button.” So, I did the same. Well, there is an animation that reads “Double click to confirm.” But many non-disabled users found that instruction unclear. This confirms that I am not alone. When I brooded over this problem, I thought how could a user with limited dexterity use this additional security method? What about other authentication methods? Are [...]