NIST response to IAWG concerns on 800-63-3 interpretation issues:
Kantara Implementation Report Response_090319.docx
For background and meetings with NIST, please see
Feedback to NIST 2019 and follow up process
NIST Conformance Criteria and Implementation resources:
https://www.nist.gov/topics/identity-access-management/nist-special-publication-800-63-digital-identity-guidelines
NIST FAQ
:
https://pages.nist.gov/800-63-FAQ/