`sympl-ssl` does not support Let's Encrypt v2 API
At present, as it's using an old Ruby library, symbiosis-ssl does not support the updated version of the Let's Encrypt API, meaning that as per this notice, it will begin to stop working in November of 2019 for new installs, and through the next year, slowly stop working.
With this in mind, it would make sense to refactor this element of Sympl into a wrapper around existing Let's Encrypt tools, such as certbot or acmetool, rather than using a third party library, retaining the existing generation of self-signed certs and general cert management.