Did you modify the virtual-machine-password.json and/or virtual-machine-sshPubliKey.json? That is the template that deploys the actual VM-Seires and need to know how many interfaces to attach to itself. "networkProfile": { "networkInterfaces": [{ "id": "[resourceId('Microsoft.Network/networkInterfaces',concat(parameters('nicName'),'0'))]", "properties": { "primary": true } }, { "id": "[resourceId('Microsoft.Network/networkInterfaces',concat(parameters('nicName'),'1'))]", "properties": { "primary": false } }, { "id": "[resourceId('Microsoft.Network/networkInterfaces',concat(parameters('nicName'),'2'))]", "properties": { "primary": false } }] }
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