Improvements to adding a passkey
Adding a passkey is clearer from start to finish, with error messages that say what went wrong and where to look.
Adding a passkey on the Security tab of your account settings is clearer now. It takes you from naming the passkey to confirming on your device and tells you when it's done, the same way creating an API token does.
When something goes wrong, the error message says what happened, so you know how to fix it.