Netgear extender EX2700 doesn't connect to DSL router DLink D2750

Hi

I am trying to extend my DLink DSL-2750U using EX2700.  The modem's WiFi is not listed when I tried to run Netgear genie at http://mywifiext.net, but the modem's WiFi is connecting to all other devices except to the extender.

I tried scanning the network using Netgear's WiFi Analytics app, and WiFi Analyzer from play store - I can clearly see the router DSL-D2750U listed as 2.4 GHz signal.

Extender's version is also latest (1.0.1.10) . I also tried manually inputting the Wireless configuration, but it says it cant connect to the router

My modem/router DLink DSL-D2750U is on WPA2 Mixed mode (I tried WPA2 AES and TKIP as well with no luck). Again, it connects to literally all other devices. Band configured is 2.4 GHz B+G+N with channel width 20/40 MHz.

I am running out of ideas, any help is appreciated

Thanks