This article explains the issue wherein onboarding an SRX to SD Cloud fails with an error related to the serial number

When onboarding an SRX using ZTP on SD Cloud, the onboarding for the device using ZTP fails, with the error:

Add single device : redirect server device registration failed. for

SN[<Device Serial Number>] error unable to update device error

This issue occurs if the SRX device was previously onboarded to a different organization and not removed from there completely. When trying to add it to a new organization, the device registration will fail.

You need to get in touch with JTAC to have this entry removed from the old org from the backend to resolve the issue.

Once removed from the old org, the device can be onboarded to the new org.