@fjohnson 

As soon as I connect the CPE210 to our switch (Edgeswitch) or router (Cradlepoint), it disables wifi for everyone. As soon as I unplug it, wifi is back on. I've tried this using AP mode too. Does anyone know if these devices are not compatible? 

Ensure the configuration is correct, no IP conflict, no network loop generated. Try following the instruction guide to configure it as Access Point mode: https://www.tp-link.com/en/support/faq/730/

BTW, the CPE is not suited to extend 360° WiFi since it has directional antennas, and the repeater mode is not actually recommended for use. If you want to use an outdoor AP for wireless coverage, EAP225-Outdoor is for your reference which has 360° Omni antennas but it's not an outdoor extender (needs to hardwire to the router/switch via cable).