The web authn standard is coming and it works great on my phone.
However when trying on my browser on computer I get
I would assume we should somehow be able to link our phone with the browser so the phone gets prompted... How can we do this?
A cool and well crafted demo: https://webauthn.me/
edit sep 2019: I also like https://webauthn.io/
Portability is not part of the standard according to the people who created it. I guess it's gonna be useless without being able to use it on different devices. So your out of luck right now.