@usmannasir I am also facing the same issue. It seems to be a bug. Because, I checked the SSL status by running openssl commands.
Hostname(dummy): sub.domain.tld
sudo openssl s_client -connect sub.domain.tld:443
sudo openssl s_client -connect sub.domain.tld:587 -starttls smtp
sudo openssl s_client -connect sub.domain.tld:993 -starttls imap
sudo openssl s_client -connect sub.domain.tld:995 -starttls pop3
The HTTP and Mail Server(587) SSL is configured correctly. Though the IMAP and POP3 did not return anything.
Moreover, the resolv.conf file has DNS resolver set correctly.
I still see the warning: Looks like something is wrong with your initial setup, please double check on Setup Wizard.