Ben here with the support team, thanks for writing in! I wanted to check in to see if you were still having issues downloading arc from the app store on your iPhone 12?
Thanks for the update. Can you provide more information about your issue with reaching your server? You may need to configure your router and network setup manually if it didn’t properly connect on its own.
When you go into your Roon core settings> Roon arc, what do you see? Please share the error code you get (without sharing your full IP address) and we can take a closer look
Here is additional information on port forwarding: