pro wifi extender "needs attention"

I recently received a new XB8 Gateway and the associated Pro WiFi Extender. The gateway activated without issue and is working fine, but the extender "needs attention." I have tried activating it in various locations and have gone through all of the recommended troubleshooting steps, but it doesn't seem to be working. It has a flashing white light on the device.

Could it be a faulty piece of equipment, or am I missing some obvious step for setting up the extender?

Thanks!

Edited to add: It is now occasionally flashing red then going back to flashing white.