Self-Host EE Fails Install on Ubuntu 20.04

On a Ubuntu 20.04 system, I was trying to install GitLab EE version for self hosting. I ran this command

sudo EXTERNAL_URL=“https://gitlab.abt33.rsint.net” apt install gitlab-ee

and during the installation I received this error:
unning handlers:
There was an error running gitlab-ctl reconfigure:

letsencrypt_certificate[gitlab.abt33.rsint.net] (letsencrypt::http_authorization
line 5) had an error: URI::InvalidURIError: acme_certificate[staging] (/opt/git
lab/embedded/cookbooks/cache/cookbooks/letsencrypt/resources/certificate.rb line
25) had an error: URI::InvalidURIError: bad URI(is not URI?): “http://zs-185-46
-212-88.gateway.zscloud.net:9480/”;"

Help anyone?

Thanks,
Doug