Let's Debug

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

www.iotplayground.tk has an A (IPv4) record ( but a request to this address over port 80 did not succeed. Your web server must have at least one working IPv4 or IPv6 address.
A timeout was experienced while communicating with www.iotplayground.tk/ Get http://www.iotplayground.tk/.well-known/acme-challenge/letsdebug-test: context deadline exceeded

@0ms: Making a request to http://www.iotplayground.tk/.well-known/acme-challenge/letsdebug-test (using initial IP
@0ms: Dialing
@10000ms: Experienced error: context deadline exceeded
A test authorization for www.iotplayground.tk to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
Fetching http://www.iotplayground.tk/.well-known/acme-challenge/PVTM78kI7v3zT6VTnFSjjnYhtZMbJxw2pOs4_AM_RuY: Timeout during connect (likely firewall problem)

Submitted May 22 16:01:11 2020. Sat in queue for 2ms. Completed in 23s. Show verbose information.