A test authorization for www.itanhaem.sp.gov.br to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
DNS problem: SERVFAIL looking up A for www.itanhaem.sp.gov.br - the domain's nameservers may be malfunctioning; DNS problem: SERVFAIL looking up AAAA for www.itanhaem.sp.gov.br - the domain's nameservers may be malfunctioning