The domain test.multicrew.co.uk is being served through Cloudflare CDN. Any Let's Encrypt certificate installed on the origin server will only encrypt traffic between the server and Cloudflare. It is strongly recommended that the SSL option 'Full SSL (strict)' be enabled.
https://support.cloudflare.com/hc/en-us/articles/200170416-What-do-the-SSL-options-mean-
The domain test.multicrew.co.uk is being served through Cloudflare CDN and a certificate has not yet been provisioned yet by Cloudflare.
https://support.cloudflare.com/hc/en-us/articles/203045244-How-long-does-it-take-for-Cloudflare-s-SSL-to-activate-
Requests made to the domain
Request to: test.multicrew.co.uk/2606:4700:30::681f:4363, Result: [Address Type=IPv6,Server=cloudflare,HTTP Status=301,Number of Redirects=1,Final HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://test.multicrew.co.uk/.well-known/acme-challenge/letsdebug-test (using initial IP 2606:4700:30::681f:4363)
@0ms: Dialing 2606:4700:30::681f:4363
@6ms: Server response: HTTP 301 Moved Permanently
@6ms: Received redirect to https://test.multicrew.co.uk/.well-known/acme-challenge/letsdebug-test
@6ms: Dialing 2606:4700:30::681f:4363
@314ms: Server response: HTTP 404 Not Found
Request to: test.multicrew.co.uk/2606:4700:30::681f:4263, Result: [Address Type=IPv6,Server=cloudflare,HTTP Status=301,Number of Redirects=1,Final HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://test.multicrew.co.uk/.well-known/acme-challenge/letsdebug-test (using initial IP 2606:4700:30::681f:4263)
@0ms: Dialing 2606:4700:30::681f:4263
@13ms: Server response: HTTP 301 Moved Permanently
@13ms: Received redirect to https://test.multicrew.co.uk/.well-known/acme-challenge/letsdebug-test
@13ms: Dialing 2606:4700:30::681f:4263
@322ms: Server response: HTTP 404 Not Found
Request to: test.multicrew.co.uk/104.31.66.99, Result: [Address Type=IPv4,Server=cloudflare,HTTP Status=301,Number of Redirects=1,Final HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://test.multicrew.co.uk/.well-known/acme-challenge/letsdebug-test (using initial IP 104.31.66.99)
@0ms: Dialing 104.31.66.99
@12ms: Server response: HTTP 301 Moved Permanently
@12ms: Received redirect to https://test.multicrew.co.uk/.well-known/acme-challenge/letsdebug-test
@12ms: Dialing 104.31.66.99
@344ms: Server response: HTTP 404 Not Found
Request to: test.multicrew.co.uk/104.31.67.99, Result: [Address Type=IPv4,Server=cloudflare,HTTP Status=301,Number of Redirects=1,Final HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://test.multicrew.co.uk/.well-known/acme-challenge/letsdebug-test (using initial IP 104.31.67.99)
@0ms: Dialing 104.31.67.99
@5ms: Server response: HTTP 301 Moved Permanently
@5ms: Received redirect to https://test.multicrew.co.uk/.well-known/acme-challenge/letsdebug-test
@6ms: Dialing 104.31.67.99
@308ms: Server response: HTTP 404 Not Found
A and AAAA records found for this domain
test.multicrew.co.uk. 0 IN A 104.31.66.99
test.multicrew.co.uk. 0 IN A 104.31.67.99
test.multicrew.co.uk. 0 IN AAAA 2606:4700:30::681f:4363
test.multicrew.co.uk. 0 IN AAAA 2606:4700:30::681f:4263
Challenge update failures for test.multicrew.co.uk in order https://acme-staging-v02.api.letsencrypt.org/acme/order/5751349/16459968
acme: error code 403 "urn:ietf:params:acme:error:unauthorized": Invalid response from http://test.multicrew.co.uk/.well-known/acme-challenge/OtUSHLOFWRS5mgdu2K5YY0vVQpZuOfGMsudDMxQocYc: "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n<html><head>\n<title>404 Not Found</title>\n</head><body>\n<h1>Not Found</h1>\n<p"
The IANA public suffix is the TLD of the Registered Domain
The TLD for test.multicrew.co.uk is: co.uk