A test authorization for hrservice.target-tec.net to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
No valid IP addresses found for hrservice.target-tec.net
No valid A or AAAA records could be ultimately resolved for hrservice.target-tec.net (including indirection via CNAME). This means that Let's Encrypt would not be able to to connect to your domain to perform HTTP validation, since it would not know where to connect to.
No A or AAAA records found.