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I am attempting to use ACME to register a letsencrypt certificate per:https://www.cisco.com/c/en/us/support/docs/security/secure-firewall-asa/222809-configure-certificate-enrollment-with-ac.html#toc-hId-1431558463I've tried it on several Firepower 10...
Resolved...I identified a DNS record type "CAA" that, if used, on your DNS server restricts which Certificate Authorities can issue certificates to your hosts. I had a CAA record added for letsencrypt.org which resolved the problem.
