All powered by TP-Link switch, according to specification Standard: 802.3af, PoE power: 55W. Only one AP installed. All testing done in 5GHz band. I don't suggest you supply power for EAP330 with...

It's weird. What's the software version of Omada Controller? The recommend Controller version is 3.0.2. Maybe you can reinstall the Controller for checking.

The recommended coverage radius of celling EAP products are about 15m. I think the celling (12m) is much high for celling EAP product, it may cause weak signal to wireless clietns.

What's the type of the Ethernet cable? I think it's better for you to use cat 5e or above Ethernet cable. And the Ethernet cable should be less than 60 meter. EAP330 need 802.3 at PoE power, the max...

I use EAP 225 V3 and OC200 They are both in same VLAN and same subnet (10.0.8.0/22) from DHCP server, check ping success to EAP and OC225 I reset EAP password many time and tried default password,...

You mean wireless clients can't get IP address from DHCP Server as long as the EAP225 is managed by Omada Controller. It may be some configuration of Controller, such as the VLAN setting of SSID in...