Encountering issues with Let's Encrypt

Hello! We are encountering issues with Let’s Encrypt and it not validating with our GitLab domain name for some reason. We have a log file of the output from gitlab-ctl reconfigure just below [ 1 ].

[ 1 ] - https://paste.gekkofyre.io/view/a69d1842#7hq38s9rZeYfhJsBqnrySnAYFEKYDpgG

If someone could assist in this matter then that would be sincerely appreciated, thank you. We are currently using a commercial certificate to get by but that has its own issues, such as not being in the CA list of some browsers and/or operating systems.

P.S.
I should mention that this is our configuration for Let’s Encrypt:

################################################################################
# Let's Encrypt integration
################################################################################
letsencrypt['enable'] = true
letsencrypt['contact_emails'] = [ 'system@gekkofyre.io' ] # This should be an array of email addresses to add as contacts
letsencrypt['group'] = 'gitlab-www'
letsencrypt['key_size'] = 4096
letsencrypt['owner'] = 'root'
letsencrypt['wwwroot'] = '/var/opt/gitlab/nginx/www'
# See http://docs.gitlab.com/omnibus/settings/ssl.html#automatic-renewal for more on these sesttings
letsencrypt['auto_renew'] = true
letsencrypt['auto_renew_hour'] = 2
letsencrypt['auto_renew_minute'] = 45 # Should be a number or cron expression, if specified.
letsencrypt['auto_renew_day_of_month'] = "*/4"


Regards,
Phobos D’thorga