WNDR3400V3-N600 - Windows 10 Connectivity Issue

Hi, I have a new DELL Inspiron (Windows 10) with a "Intel Dual Band Wireless AC 3165" which I am unable to connect to WNDR3400V3-N600 router. Other existing devices like Android, iOS and Printer are connected through the router and work fine. I get the message "Checking Network Requirements" and a while later get "Can't Connect to this network". The wired connection is working all right. I disabled access control and even tried security 'None' briefly. But, no success. The wireless connection also connected to another non-NetGear router earlier, suggesting that the problem is specific to NetGear environment.

Adapter Driver - Intel latest version (18.20.0.9)
Router S/w - Latest Version (V.1.0.1.2_1.0.51)

I even fell back to earlier versions of the Intel adapter such as 18.12.0.3 & 17.15.0.5 but with no success.

Any help is appreciated. TIA.