Dear Idris_K,

Sorry to hear that you have some trouble with the TP-Link products.

If you cannot connect to the WiFi network, it's likely that the EAP225 doesn't obtain an IP address from the router (DHCP Server).

Please check whether the EAP225 is wired connected to the router properly in your network, you may change a cable, connect to a different LAN port to have a try.

Besides, you could disconnect the cable from the LAN port of the PoE injector and then connect the cable to a computer instead, test whether the PC can obtain an IP address automatically from the router or not.

Hope this information is helpful. Have a nice day!