Thanks :) Regarding security keys, actually it depends: if you are enrolled in advanced protection no you must have two security keys and we don't fall back. F

Thanks :) Regarding security keys, actually it depends: if you are enrolled in advanced protection no you must have two security keys and we don't fall back. For normal users that is the case yes. Until phone as a security keys is widely used and security keys are main stream the no fall back option can't be the default but hopefully we get there :)