Flashing app only works when connected to phone hotspot


I’m trying to flash an app to my Argon. This works when the device is connected to my phone’s WiFi hotspot, but fails when conntected to my router.

Argon firmware: 0.8.0-rc.27

Router: Compal CH7465LG-ZG (https://us.hardware.info/product/371250/compal-ch7465lg-zg-ziggo-connect-box/specifications). It is provided by my local ISP (Ziggo) and supports IPv6.

Any idea how to resolve this?