ftps.sis.tv has an A (IPv4) record (51.145.47.97) 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.
Get http://ftps.sis.tv/.well-known/acme-challenge/letsdebug-test: dial tcp 51.145.47.97:80: connect: connection refused
Trace:
@0ms: Making a request to http://ftps.sis.tv/.well-known/acme-challenge/letsdebug-test (using initial IP 51.145.47.97)
@0ms: Dialing 51.145.47.97
@70ms: Experienced error: dial tcp 51.145.47.97:80: connect: connection refused
A test authorization for ftps.sis.tv to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
Fetching http://ftps.sis.tv/.well-known/acme-challenge/qo_OjcDeTThSAWJgN0W5-5H_jLrt9Q8hCuyWoYE0F-U: Connection refused