Folluw up to my earlier post. Turns out that all 3 deco units did show up in the app, but as seperate networks instead of all under 1 network. Tracing back the steps I took during initial setup this...

My setup: ISP Media Convertor / Router in bridge mode | D-Link DSR-1000 VPN Router (Harware version A1; Firmware version 2.11B201C_WW) | D-Link DGS-1210-52 (Hardware version B2; Firmware version...