The serial number is broadcast and shown in the HS Drone Go2 app when inputting the drone details. The serial number is also on a sticker on the side of the rid module, you input the serial number into the faa data field of "add device" with maker and a few other details-submit and then it shows up in your registered inventory section, that's it, that's all, your good to go. One other thing once you input a drone and its details, the HS rid module locks it in and broadcasts only that drone and details- you have to reprogram it for each drone you fly with.
No, I could not see it thru drone scanner, problem with drone scanner or its settings for sure, The Holy Stone app finds it when its scanning for it- the rid module has to be in programming mode not broadcasting mode as well, so its pretty much a poor app is drone scanner- needs a serious update and a serious price drop.
Cheers
3Fees