Jefferson, sorry to hear about your issues getting ARC to work. I am a fellow user, but if you can supply a bit more information we can work on helping resolve your problem:
Who is your internet service provider?
Please list the make and model of your modem and router?
Do you have any additional network hardware, like additional routers or managed switches?
Does your network have any VPNs, proxy servers, or enterprise-grade security?
Thank you @Jefferson_Douglas. You are not seeing any error message under Settings → ARC, is that correct? Have you confirmed your WiFi settings are correct in your network for iPhone and iPad, and if so, do they connect to the Core within your home over the ARC app? What about the regular iOS app?
Yes I have the original Roon remote on my iPhone and iPad and that connects to the core without issues. It’s only the ARC App that fails to find the core
At this point, I can’t access the settings section on either of the ARC apps (iPhone / iPad). I only get to the login screen, enter my credentials and then get logged in, but receive the message “no Roon cores found”