I've been messing around with my Google Titan Key and learned that each authentication challenge returns a counter for how many times the key has been accessed.
The only way I can think that this works is that there's some storage on the device. That would mean that there's a limit for the number of applications that can register with the device.
How many applications can I register with my Google Titan Key and what can I expect to happen when I go to register 1 too many?