touch ID not working on 2019 macbook air

Thanks for your reply - and I always enjoy my Apple gear (since 1988). I think there might be more to the Touch ID problem than a third-party device, however, as I now find that I have to put in my password for all sorts of things I do on the MBA, including moving a file from one folder to another, or deleting a file (I can't find a way of turning this off, which is another problem), and it will *only* let me use the password, not Touch ID, even though the message says I can use either. Unless you happen to have an idea what's going on here, I'll get in touch with Apple when I return to Canada next week.

I just discovered that it had nothing to do with a

third-party device. Aside from the password problems just posted, I can't

access the screen after it goes to sleep when *any* device is plugged in. I

have an iPod Touch plugged in with an *Apple proprietary* USB-C to lightning

cable, and Touch ID refuses to work. Furthermore, the iPod Touch shows a

message saying "This accessory is not supported by this device" -

though it does appear to be charging all the same. I got exactly the same

message when I plugged in an iPad Mini (same cable), only this time it refused

to charge, IT'S ALL APPLE GEAR. What is going on here??

I discovered what the problem was. I was using a third-party USB-C to USB converter. As soon as I unplugged it, the problem went away. Thank you, however, for your reply.