tree/master/visual-studio-dev-vm: ImageNotFound in Development VMs

I tried to deploy the Windows10:N and W2012R2 with VS2015 community ed. + Azure SDK 2.9 I get an imageNotFound error:

{
"error": {
"code": "ImageNotFound",
"target": "imageReference",
"message": "The platform image 'MicrosoftVisualStudio:VisualStudio:VS-2015-Ent-VSU3-AzureSDK-291-WS2012R2:latest' is not available. Verify that all fields in the storage profile are correct."
}
}

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[Template Name goes here](Template link goes here)

### Issue Details

### Repro steps (*if necessary, delete otherwise*)
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Start with the visual-studio-dev-vm path named in the issue and inspect how its Windows development VM image is referenced. Reproduce the deployment using the reported imageReference, then verify the currently available Azure platform image and document a confirmed resolution for the template.

Written by the indexing model from the issue text.