CTK env value "None" String is not Allowed

in the MDS deviceinfo document, it says
for devices that are not registered the environment is “None”.
I set the env filed with “None” String for the not registered device, but the CTK Tested failed。

I looked into the ctk code file 【DeviceInfoNotRegisteredResponseSchema.json】
it only allow values are “Staging”, “Developer”, “Pre-Production” or “Production”
just as the image below shows

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Thank you for the inputs.

Will update it accordingly.