In FIDO2 multi-factor authentication, platform authenticators aim to be the answer to our usability woes. Platform authenticators are a huge leap, but they still have major barriers to adoption within the enterprise. The downsides are usability and cost, as well as the followingings:. Users need to use the platform authenticator to authenticate to their device, and it is expensive to procure and distribute to the entire workforce. It can only ever be used on the platform for which they were created. It is a massive roadblock because organizations will have a complex deployment and enrollment flows.
Source: https://www.helpnetsecurity.com/2021/07/05/fido2-authenticators/