At the moment, two factor authentication (2FA) is only possible using an Enterprise Miro account.
For security reasons, I strongly advise that this feature should be available for every account type.
You know that there is a lot of hacking going on, and that many cloud services (GitHub, Paypal, Steam, ...) offer or force 2FA. It is the state of current security art to offer a 2FA functionality to improve security and make our accounts more secure, prevent hacking, phishing and data theft.
I do not believe that this feature should be allowed for enterprise accounts only.