@webprofusion I'm pretty sure certbot 0.40.0 has V2 capabilities (checked: since 0.26.0 ACMEv2 is the default API) and that this error is not due to the fact it tries to connect to the V1 API: why would that result in such a specific OpenSSL PEM error?
@Friday13 Please provide the contents of the certbot log from /var/log/letsencrypt/letsencrypt.log