Can't add host to Certificate Expiry Integration

Hello! I’ve installed HA at the office. It is a VM and we have Pfsense. HA is in the DMZ segment. I’ve setup DMZ to Lan rules. Lan to DMZ rules and Outbound rules. Https access is working fine. Port 443 is opened to internet. . But…
I can’t add duckdns url to certificate expiry integration using port 443. I only works with only using port 80 and it is not opened to internet.
Any help will be appreciated! Thanks
Certificate To test