Hi @SonSun,

There are several ways to configure the TP-Link EAP Access points:

1) As standalone in the AP 

2) using a PC's web browser to the emdedded web management page

3) Adopting into Omada/SDN SW management platform.

I suggest you start by doing a hard reset of the device, ensuring you have an adequate/appropriate PoE power supply, and reviewing the installation and configuration instructions.

Installation Instructions

https://static.tp-link.com/2020/202007/20200707/7106508840_EAP%20Series_IG.pdf

User Guide

https://static.tp-link.com/2020/202007/20200706/1910012768-EAP%20Series_UG.pdf

-Jonathan