MS Azure Active Entra's FIDO2 implementation only allows a select list of vendors. You need a certification from FIDO ($,$$$), you need to have an account that can upload on the MDS metadata service, and you need to talk to MS to see if they'll consider adding you to the list
It's not completely closed, but in practice no one on that list is a small independent open source project, those are all the kind of entrenched corporate security companies you'd expect
It's not completely closed, but in practice no one on that list is a small independent open source project, those are all the kind of entrenched corporate security companies you'd expect