Dear @JUSTO74 ,

 i have just added an EAP245 to use in my loft as an access point 'to replace another access point', i set the SSID and passwords as the same as my networks router, i have disabled the 2.4ghz as the router is only configured to 5ghz. I have 2 Nest outdoor cameras which are not connecting to it, seeing as the SSID and passwords are the same i would have thought that they should connect no problem. 

Is the EAP245 connected to the router via Ethernet cable?  If you power off the EAP, are you able to get internet access from the router WiFi? 

Here is a post about common questions about TP-Link EAP device when it’s used in home network:

https://community.tp-link.com/en/business/forum/topic/228718