Due to a modem replacement, and no longer being able to setup static IP addressing on it due to it being a rented ISP modem, I need to configure a TP-Link CPE210 to act as an access point.

Previously I set a static IP address for the AP and it worked fine using the modem, however the router doesn't seem to recognize anything is plugged in. The indicator light on the front works, but in the router status itself it is unable to recognize the CPE210. I set manual static addresses as well for this CPE210, but nothing indicates the router can see / utilize this. I've set the router itself as the gateway on the CPE210 to no avail. I've tried the router IP and the modem IP as gateway. I must be missing something but with these both being TP-Link devices is there any additional setup I may be missing?