Anyone else unimpressed with Twitter's U2F/FIDO token support? They support a total of 1 (one) U2F token on an account :( The only other company I know that does that is AWS and one U2F token. Every other site I use allows multiples, usually at least 5 or more. I setup U2F on Twitter but then got rid of it after realizing they only allow one.
AWS has a simple workaround though as you can create as many users as you want, each with its own unique token. Combined with roles it’s straightforward to set up a backup user / device. It makes sense technically to have a single token anyway. Otherwise you either need to include then identifier of the auth token (in addition to the secret) or have the verification step try out all N options.
I'm not sure if that is true. Most sites support multiple tokens. Off the top of my head I can think of Google, Facebook, Github, Gitlab, and more that support multiple. So it seems like the normal method is to support multiple.
One one site I have over 5 auth tokens configured. And tested with four of them connected to my PC at the same time. I could tap on any one of them to authenticate. This is on a Windows 10 PC.