@ChristopherGAndrews We are finding this hard to reproduce. Can you patch your board with one of the makecode .uf2 files by dragging and droping on the usb drive. They retry the same scenario?

Does this repro on a different windows 10 device?

Apparently I did not hit the comment button, try two...

Testing on another Windwos 10 computer I was not able to reproduce the error. I have tried two different CPEs on my computer and they both have this issue. It seems like there is a driver issue on my computer. I think there is a config issue the the Makecode install.

On a side note, I just found this blog post showing how to use WebUSB and Google Chrome:

https://blog.adafruit.com/2018/08/02/use-webusb-to-allow-microsoft-makecode-to-download-direct-to-circuit-playground-express/

I tested it on my computer and it works perfectly. So all of the USB functionality is fine on my computer, it is just the method that the installed app uses to connect. Uninstalling the app does not resolve the error. I have tried all the steps in the Windows App troubleshooting:

https://makecode.adafruit.com/device/windows-app/troubleshoot

I have tried:

• Undocking my notebook to remove all other usb devices and hubs
• I have tried each of the three USB ports on the notebook
• I have uninstall the devices
  • HID - HID-Compliant vendor-defined device
  • HID - All of the "USB Input Device"
  • USB Controllers - All of the "USB Composite Device"
  • USB devices - PXT Device

Plugging in the PCE reinstalls all of the devices, but it still is not detected by the Windows App.

Hi, I am having this same exact issue - did you ever find a solution? Seems to b isolated to one laptop running windows 10 - other (older laptops) running windows 10 do not have this issue