> Does anyone know if Google allows registering more than 2 keys? Like what if i want to register 3 or 4 keys for advanced protection? Most sites do. Google an

> Does anyone know if Google allows registering more than 2 keys? Like what if i want to register 3 or 4 keys for advanced protection? Most sites do. Google and Github both allow multiple U2F keys (note that this means any key can be used to unlock your account, not that all are required). Of all the large and popular sites that support U2F, the only one that I'm aware of that only allows one key is Twitter.