If you open up the Developer Tools (F12) on the SSL/TLS → Edge Certificate page, it should also show the actual error which would be very useful to know.
From the WHOIS, I see Registrar Status: clientDeleteProhibited, clientRenewProhibited, clientTransferProhibited, clientUpdateProhibited
May I suggest below article for help and troubleshooting:
Thank you for sharing. I have escalated it.
Kindly and patiently wait for the reply.
;QUESTION
trexplus.com. IN NS
;ANSWER
trexplus.com. 21600 IN NS ns2.dns-parking.com.
trexplus.com. 21600 IN NS ns1.dns-parking.com.
You should troubleshoot this with domain registrar → GoDaddy and change domain nameservers to the provided set of Cloudflare nameserver (which you got while adding your domain name to your Cloudflare account) for your domain name.
May I share few posts for you just to re-check if it’s still related to GoDaddy interface and nameserver change:
Otherwise, have you tried writing a ticket to GoDaddy Support?
Hi,
The domain is not Active so domain has to be activated (by updating the nameservers) and then you will be allowed to enabled Universal SSL as described in: