Hills Reliance 128 Alarm System and UltraSync+

I am trying to setup my Hills Reliance 128 Alarm System with UltraSync+ within my HomeAssistant. I have installed the integration successfully via HACS, but for some reason, I cannot get it to configure within the Integrations section of HomeAssistant.
Here is how I am configuring it. The IP address is definitely correct and the actual username and pin are what I have configured within the UltraSync+ app via my phone (I added a dedicated HomeAssistant user within the app)

When I try to connect, all I get is this:

Can anyone assist with what I am doing wrong?

The UltraSync+ app on my phone works a treat, it’s just getting it to connect to HomeAssistant.

Thank you.