Nginx welcome page after migrating to Ubuntu package (20.04.2)

Checklist
[X] I have read intro post: About the Installation Issues category
[X] I have read the tutorials, help and searched for similar issues
[X] I provide relevant information about my server (component names and versions, etc.)
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[X] I describe the steps I have taken to trouble shoot the problem
[X] I describe the steps on how to reproduce the issue

Overview:
I just switched our Passbolt installation to an Ubuntu package via the Passbolt documentation here: Passbolt Help | Migrate passbolt CE from install scripts to Ubuntu package

I followed all the steps properly and it migrated my database and everything, but when I go to visit the URL, I just get the nginx welcome page:
image

I looked inside /etc/nginx/conf.d and there are no config files in here for Passbolt - is there supposed to be one in there?

Information
Ubtunu Version: 20.04.2 LTS
Passbolt Version:
PHP Version: 7.4
Nginx Version: 1.18.0

Hello, I have the same issue. It was working fine till last week, and suddenly from yesterday, I see nginx welcome screen. However, it works with SSL https://passbolt.domain.com. Hope that helps.