Websites blocking FIDO vendors is nothing new. In corporate environments this may be necessary. Imagine a 2-tiered environment where generally all vendors are a

Websites blocking FIDO vendors is nothing new. In corporate environments this may be necessary. Imagine a 2-tiered environment where generally all vendors are allowed (no blocks) for accessing tier-1 information, but to access tier-2 you need a special vendor. That is not uncommon. By the way, SAML has similar authentication restrictions, so this is not something FIDO came up with.