Saw you ask in another thread so copying my response here: I had this same error, but it was caused by switching to a different webauthn library in the backend server. The new library encodes things slightly differently which I think doesn't play nicely with AuthenticationServices.

I had this same error, but it was caused by switching to a different webauthn library in the backend server. The new library encodes things slightly differently which I think doesn't play nicely with AuthenticationServices.

Thanks, the feedback number is FB11967949.