For some reason I cannot get Keyboard Clicks and the Lock Sound working on my iPhone X (iOS 13.3). The volume on the phone is about 50%. Keyboard Clicks and Lock Sound are enabled in Sounds & Haptics in Settings. The phone is not on DND or Airplane Mode.
Thanks for all the suggestions. Since I had some downtime, I reset the iPhone to factory, which forces an iOS “reinstall”. All’s well, now. Clicks are back.
I had been doing some TestFlight tests of an app for a friend and maybe that introduced a bug – again, very unlikely, but since things are now back to normal I’m going to consider that testing as the culprit.