Roon ARC does work on iOS device meanwhile doesn't on Android device

Hello Roon team.

I’ve been using Roon arc through iOS and it works perfectly outside of my home network like below.

Recently I added a new Android device (Moondrop MIAD01 to be exact, a cheap Chinese Android phone/DAP) only to find out my Roon ARC (Android) app can’t connect to Roon server outside. It does connect and work well only both when I’m at home and (home) wi-fi connected. If I went outside, it suddenly stop to connect.
ARC Connection Status saying “Port Forwarding Issue: Check the ARC settings on your Roon Server” while it can’t be a issue because at the very same time my iPhone’s Roon ARC works very well.

I have delete and re-install Roon ARC on Android several times. Didn’t help anything.
Is there anything I forgot or there is an real issue with Roon?

Hi @Seung-Gyun_Lim,
Thanks for reaching out to us about this issue. I agree that this isn’t a port forwarding issue. Can you reproduce ARC losing the connection when you leave your home Wi-Fi and let us know the date and time that it happens. We can use that information to locate the event in your phone’s ARC logs which should help diagnose the trouble.