Load images from unsecured domain (http://...) not loading with AlamofireImage

Question

I am using AlamofireImage to load images from URLs and whenever the URL is something like https://picsum.photos/200/300 it works. Whenever it comes from our current developing server http://15.XXX.XX.XX:8180 they don't load and it says timeout.

I have enabled the App Transport Security:

<key>NSAppTransportSecurity</key>
    <dict>
      <key>NSAllowsArbitraryLoads</key>
          <true/>
    </dict>

Any idea how to fix it? It won't be like this in the future but I need to show a beta to a client and at the moment we don't have the SSL certificate.

Thank you