@dselzle I found the issue. My wifi network had been set to WPA2/WPA3 with PMF "optional". Evidently the CPE510 can't handle that correctly. Changing it to WPA2 with PMF disabled fixed the issue, and...

I've had a CPE510 used in client mode to connect to a 5GHz network from a Ubiquiti AP for the last few months. I recently made some changes to the network that required factory resetting the CPE510....