Let's Debug

Test result for www.iotplayground.tk using http-01

A fatal issue occurred during the DNS lookup process for www.iotplayground.tk/A.
DNS response for www.iotplayground.tk/A did not have an acceptable response code: SERVFAIL
A fatal issue occurred during the DNS lookup process for www.iotplayground.tk/AAAA.
DNS response for www.iotplayground.tk/AAAA did not have an acceptable response code: SERVFAIL
A fatal issue occurred during the DNS lookup process for iotplayground.tk/CAA.
DNS response for iotplayground.tk/CAA did not have an acceptable response code: SERVFAIL
Fatal
No valid A or AAAA records could be ultimately resolved for www.iotplayground.tk. 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.
Debug
The IANA public suffix is the TLD of the Registered Domain
The TLD for www.iotplayground.tk is: tk
Debug
2 Certificates contributing to rate limits for this domain

Serial: 294446961051962101086881514776624350651278
NotBefore: 2020-11-20 22:49:28 +0000 UTC
Names: [www.iotplayground.tk]

Serial: 365469245555004764340181505070808722174494
NotBefore: 2020-11-20 17:49:18 +0000 UTC
Names: [socket.iotplayground.tk]

Debug
The current status.io status for Let's Encrypt
Operational

Submitted Nov 25 18:02:06 2020. Sat in queue for 2ms. Completed in 53s. Hide verbose information.