Why does a wired session show no IP address or data usage?

Because the switch doesn't tell us, and Passbeam only shows what the equipment sends.

It's the equipment, not wired as such. A wireless access point handles the device's whole connection and reports its IP address and data used. A switch only authorises the port. The device gets its address from a DHCP server the switch has no part in, so the switch has nothing to report.

It isn't about RADIUS or RADSec either. The switch reports the same over both, and Wi-Fi over standard RADIUS reports the address fine.

A wired session shows the switch port instead, like Gigabitethernet 0/17, which is often more useful for a desk PC. For the IP address, check your DHCP server or the switch's client list, using the MAC address on the session.

Some managed switches can be set to report the address. If yours does, it shows here with no change needed on our side.