Hi, I’m on the same boat!, it is impressive hoy poorly documented this is considering that the Link and Node have been around since at least 2015…
On the Wio Link (which i have working perfectly on Arduino IDE and other platforms) you have to define PIN 15 as an Output and pull it High on Setup, otherwise no power is applied to the ports. This also allows you to shut everything down on your Software.
I have yet to find which pin is the right one for the Node.
Let me know if you have any luck!!