Resolved
This incident has been resolved.
Monitoring
We are seeing recovery and certificates are now issuing normally. We are continuing to monitor to ensure full recovery.
Identified
Due to a service outage at LetsEncrypt, creating new certificates with fly certs add is failing.
Existing certificates and *.fly.dev preview certificates are not impacted. For additional details please see LetsEncrypt's statuspage https://letsencrypt.status.io/pages/incident/55957a99e800baa4470002da/69fe2d6698ca07050eb4b1b3