I working with the Interstate 75W (picoW) , and try to run some test programs in Thony. There were two libs that are need to get the example running.
import WIFI_CONFIG from network_manager import NetworkManager
What uf2 file did you flash it with?
The examples in the 75W directory use Interstate 75 W’s wireless functions and may require extra files to be installed. You can find WIFI_CONFIG.py and network_manager.py in examples/micropython/common.
WIFI_CONFIG.py
network_manager.py
Lots of other info in our Interstate Learn Guide - Getting Started with Interstate 75 :)