Although most devices that use Wi-Fi are compatible with Google Nest Wifi Pro, Nest Wifi, and Google Wifi devices, there are a few that aren't. Usually, this is because they lack the latest hardware or software supported by Wifi devices.
WPA and WEP devices
Wifi devices only support devices with WPA2 + PSK or WPA3 + PSK, which are the most popular methods of securing your network. Older devices that only have WPA or WEP encryption, such as old printers, won't be able to connect to Wifi devices.
We don't support older protocols because they can be unsecure, as noted by security research community and industry experts. Nest Wifi and Google Wifi keep you safe, and WPA2 or WPA3 are one of the many ways we ensure that.
Try to find a new driver for your older Wi-Fi device. If the Wi-Fi driver can't be upgraded, the hardware on the device might need to be replaced with a newer version that supports the newer secure protocols.