Custom Windows image creates Linux disk instead of Windows disk

[JSchissler]

I generalized a VHD, uploaded it to Azure and created an image in Azure from this VHD.
When deploying with vagrant up the resources are created. However, the OS disk is created as Linux and not as Windows.
The image is created as Windows.

In the vagrantfile the following entries are made:

azure.vm_managed_image_id = '/subscriptions/subscriptionid/resourceGroups/resourcegroupname/providers/Microsoft.Compute/images/AZDeploy_gen'.

azure.vm_operating_system = "Windows"
etc.

I can create a VM using this image in the azure portal successfully.

What is the problem?
I would be happy to provide further information if necessary.

[JSchissler]

no solution to the problem?