Let's Encrypt ACMEv1 no longer working as of NOV 8 2019 - Breaking LE Cert Creation and Renewal

FPBX uses ACMEv1 for Certificate Requests via Let's Encrypt. LE has designated ACMEv1 EOL and being shut down NOV 8 2019. It will NOT allow any new certs to be registered as a result. All existing certs will stop working JUNE 1 2021.

FPBX must update to use ACMEv2 to resolve the problem.

This is a critical issue, anyone using a LE certificate and using TLS or other forms of encrypted communication will entirely go down as a result of their certs expiring because of this issue with FPBX using ACMEv1.

All new installations will not be able to generate certs either, and would have to use a commercial CA.

https://community.letsencrypt.org/t/end-of-life-plan-for-acmev1/88430

In addition, it appears that beyond just the ACMEv1 to ACMEv2 change, they are also implementing some kind of authentication with the requests:

https://community.letsencrypt.org/t/acme-v2-scheduled-deprecation-of-unauthenticated-resource-gets/74380