Can MFA function like a security key?

Hello @globetro! 👋

If you've setup a Security Key for your Cloudflare account then you'll need to use that Security Key in order to satisfy the multifactor authentication challenge when signing in to your Cloudflare account. 1Password doesn't have the ability to satisfy the MFA challenge if your only second factor is a Security Key, but, as you've noted, 1Password can fill a one-time passcode if you've stored your one-time passcode for Cloudflare in 1Password. You can read more about using 1Password as an authenticator app here: Use 1Password as an authenticator for sites with two-factor authentication

It sounds like something might have changed on the Cloudflare end, do you have a Security Key setup for your Cloudflare account? If you use the Security Key are you able to log in?

I look forward to hearing from you. 🙂