Reason for failure of the authorization attempt for the
domain.
Values:
FAILURE_REASON_UNSPECIFIED (0):
FailureReason is unspecified.
CONFIG (1):
There was a problem with the user's DNS or
load balancer configuration for this domain.
CAA (2):
Certificate issuance forbidden by an explicit
CAA record for the domain or a failure to check
CAA records for the domain.
RATE_LIMITED (3):
Reached a CA or internal rate-limit for the
domain, e.g. for certificates per top-level
private domain.