Apache Admin Manager lost after adding Virtual Hosts

I wanted to host a couple of websites (and apps) on the same VPS, so my idea was to have it like this:

Site 1

• HTML content only Site 2
• PHP and HTML content Site 3
• Java / SpringBoot app Site 4
• Python app Site 5
• Java / SpringBoot app

So I thought I would start with Apache. I installed Apache, configured it to work with my domain (an actual one, not from hosts) and it loaded the basic HTML page. Before I did this, I tested my-domain.com:8080 and it showed the Apache Admin page, all fine. Unfortunately, now after adding my first VirtualHost (and deleting the default one), my Admin page is not accessible anymore (getting a timeout). I also used Let’s Encrypt to test how SSL works.

The current state of sites-enabled:

000-default: NOT ENABLED, doesn’t work even if enabled my-domain.com: ENABLED, working with SSL, redirects to SSL by default my-domain2-from-hosts-file: ENABLED, not working, redirects to the default domain

Ideally, I’d like to have a different VirtualHost/domain for each WAR deployed, but let’s get the admin/manager page working first.

What could I be doing wrong? I can post logs and config if needed.