Let's Debug

Test result for sip41.telco.co.zw using http-01

DNSLookupFailed
Fatal
A fatal issue occurred during the DNS lookup process for sip41.telco.co.zw/AAAA.
DNS response for sip41.telco.co.zw/AAAA did not have an acceptable response code: SERVFAIL
NoRecords
Fatal
No valid A or AAAA records could be ultimately resolved for sip41.telco.co.zw. 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.
PublicSuffix
Debug
The IANA public suffix is the TLD of the Registered Domain
The TLD for sip41.telco.co.zw is: co.zw
StatusIO
Debug
The current status.io status for Let's Encrypt
Operational

Submitted Jan 4 09:07:21 2019. Sat in queue for 7ms. Completed in 3s. Hide verbose information.