Update to include more info:
if I include --debug in the command, this is what I see.
Found 1 image to regenerate.
Notice: Undefined index: name in /home/site/wwwroot/wp-content/plugins/windows-azure-storage/windows-azure-storage.php on line 394
Notice: Undefined index: _wpnonce in /home/site/wwwroot/wp-content/plugins/windows-azure-storage/windows-azure-storage.php on line 394
1/1 Regenerated thumbnails for "test-image" (ID <the id>).
Success: Regenerated 1 of 1 images.
So, it appears to not be able to locate the post name and _wpnonce.
