The interesting tidbit here is around iOS 12.2 and 12.3 (and I assume also affects macOS 10.14.5 but people generally use USB based U2F hardware keys). In the

The interesting tidbit here is around iOS 12.2 and 12.3 (and I assume also affects macOS 10.14.5 but people generally use USB based U2F hardware keys). In the 10.14.5 what's new page, it says "Disables accessories with insecure Bluetooth connections."