[subleq]

When I try to create an account, I get an error message:

> Your security key can't be used with this site

> www.deadmansswitch.net may require a newer or different kind of security key

This is with a Yubico Security Key 2 which I thought supported FIDO2.

[StavrosK]

You can't create an account with a key on that site, you can only use it to log in after you associate it to the site.