Class Reason (1.3.1) 

Reason(value)

Values: REASON_UNSPECIFIED (0):

AUTHORIZATION_ISSUE (1):
    Certificate provisioning failed due to an issue with one or
    more of the domains on the certificate. For details of which
    domains failed, consult the `authorization_attempt_info`
    field.
RATE_LIMITED (2):
    Exceeded Certificate Authority quotas or
    internal rate limits of the system. Provisioning
    may take longer to complete.