Running a flow with the "device" node in it

At first I was messing around with a door sensor and not having any luck with getting a notification sent to my phone that it was open. In debug I could see the event: state node successfully getting the state of the sensor and debug messages indicated as much, but I would never get the notification.

After getting annoyed having to get up to open and close the door, I figured Postman could help me with quick testing by creating an http in and http response and stick a device in between them. Weirdly I get a 502: Bad Gateway response. I take the device out from between them, and I get a 200.

I know the device node says experimental, but has anyone been able to get one to run?

Yes.

Since there is not much else we can help you with that is all I can say.
Had you included some entity information, debugs logs, a flow, a picture then it would be easier to help, but now all I can say is yes.