Adding app feedback here to the numerous requests for VPN support.

I tunnel my internet connection to my home network over a Wireshark VPN while working remotely. The app flat out refuses to acknowledge my Sonos system (including Ace headphones) in spite of being connected to my home network where the app has access to Sonos product discovery packets. I can confirm that the devices are all accessible via their normal IP addresses, and that discovery packets are present on the network over VPN. 

I would like to strongly recommend that the app attempts discovery of a known Sonos system despite whatever wifi SSID it detects. There is no reason why it shouldn’t.

My two cents.