I installed in my Sony VAIO (SVE1512H6EW) the Intel dual band Wireless-AC 7260. According to the device manager the AC 7260 is working properly, with up to date drivers from the Intel site, but no internet connection is possible. In the netwok centre Wifi 3 is indicated but can not be switched on. Installing the old wireless network card again gives immediately internet access via Wifi (without an added number).
It may result that this wireless adapter is not compatible with your system. Your best option would be to consult SONY* for assistance as they are the only ones that can provide you a list of tested, certified and approved cards that are compatible with your system. Please bear in mind that Intel does not support this type of integration so we recommend that you access this link for further information: http://www.intel.com/support/wireless/wlan/sb/cs-011644.htm Intel® Wi-Fi Products — Regulatory Information Regarding Hardware Installation or Upgrade
On our best effort to help you, we also recommend that you look access these links:
http://www.intel.com/support/wireless/wlan/sb/CS-031167.htm Intel® Wi-Fi Products — Why Doesn't My Laptop Recognize My New Intel Wireless Adapter?
http://www.intel.com/support/wireless/wlan/sb/CS-025332.htm Intel® Wi-Fi Products — Resolving Wi-Fi Network Connection Issues
http://www.intel.com/support/wireless/wlan/sb/CS-034875.htm Intel® Wi-Fi Products — TechNote: Access Point Interoperability Issue with uAPSD