How to get enablement binary for passkeymanager - Webauthn experimental APIs

I have been trying to run the passkeymanager sample provided by MS for testing the new Webauthn experimental API .

I have windows insider preview Beta Channel

The windows version I have is 26120.3281 and windows SDK  version 10.0.26100.1742

I am able to run the passkeyManager Sample but when I try to register the contosso app,

I get the result as E_NOTIMPL Not implemented when i call the  EXPERIMENTAL_WebAuthNPluginAddAuthenticator API 

The MS tech person suggested to use enablement binary but I am not sure where to find the enablement binary for the APIs.

Any help on this is highly appreciated