GA Local Fulfillment Validation

I am struggling validating local fulfillment is performing correctly.
I’m not sure I quite understand how to debug following these instructions.

I’m not sure what I am supposed to see under chrome://inspect#devices.
Is my HA installation supposed to be in the list?

Also, I am using NGINX and I am successful in accessing my Home Assistant installation from both inside and outside of my network, if that matters.