Windows Sandbox fails to start with Error 0x80070015: The device is not ready

Hi,

Thank you for writing to Microsoft Community Forums.

I understand that you are unable to use Sandbox on Windows 10 1903 and you receive an error message “The device is not ready”.

I would like to let you know that the issue has already been reported and is being investigated by our engineering team. Meanwhile, I would suggest you to post a feedback regarding this issue using the feedback hub app on Windows 10. You can also provide up-vote to an existing feedback also, refer the link: https://aka.ms/AA55zhx.

Regards,

Prakhar Khare

Microsoft Community – Moderator

I have two machines on which I have installed production release 1903, Windows Sandbox runs on one, but on the other I get Error 0x80070015: The device is not ready.  I have searched through the event log and can't find any events that appear to be related.  I'm not even sure where to start.

I've read some articles from the pre-release that indicated that they found log entries somewhere, but found no details on where else to look.  I looked through all the Hyper-V log groups I could find with no luck.

Help?