@texas46rv, perform a hard reset on the fourth AP to load factory defaults (press the RESET button and hold it for ~7 seconds until the LED flashes green-yellow-red) and try again to adopt it. You can also read this recipe what to do if an EAP can't be adopted: https://community.tp-link.com/en/business/forum/topic/164118

Dear @texas46rv,

using omada cloud controller, successfully added 3 eap225 outdoor. trying to add fourth, the ap defaults to 192 address but shows up, when i try and adopt it fails.

How do you power up the 4 EAP225-Outdoor, via provided PoE injector or via a PoE switch?

When you notice the AP shows up with default 192.168.0.254 on the controller, it means the EAP is failed to obtain an IP address from the DHCP server in the network, please ensure the EAP is well connected to the network via a working cable, and verify the DHCP IP pool is not overloaded.