Invalid image format 'vhdx'

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Hi, I'm trying to get Nova on Hyper-V to work with vhdx Glance images. The images works well when started on Linux KVM, but on Hyper-V I get the following error in nova.log.

2017-02-21 16:38:18.236 7124 ERROR nova.compute.manager [instance: ca6e66e5-aba3-43c9-8150-9beca16e0d91] nova.exception.InvalidImageFormat: Invalid image format 'vhdx'

I can boot other images in VHD format fine on the same hypervisor. We run Newton release (via Kolla) and use the nova Windows components from https://cloudbase.it/downloads/HyperV...Newton1401.zip. Any idea what could be the cause of this? As far as I understand it vhdx should be supported.

My nova.conf looks like this:

[DEFAULT]
auth_strategy=keystone
image_service=nova.image.glance.GlanceImageService
compute_driver=compute_hyperv.driver.HyperVDriver
network_api_class=nova.network.neutronv2.api.API
volume_api_class=nova.volume.cinder.API
instances_path=C:\OpenStack\Instances
use_cow_images=true
flat_injected=true
mkisofs_cmd=C:\Program Files\Cloudbase Solutions\OpenStack\Nova\bin\mkisofs.exe
verbose=true
allow_resize_to_same_host=true
running_deleted_instance_action=reap
running_deleted_instance_poll_interval=120
resize_confirm_window=5
resume_guests_state_on_host_boot=true
rpc_response_timeout=1800
use_neutron=true
vif_plugging_is_fatal=false
vif_plugging_timeout=60
rpc_backend=rabbit
logdir=C:\OpenStack\Log\
logfile=nova-compute.log
force_config_drive=True
debug = False
transport_url = rabbit://openstack:password@10.60.11.21:5672,openstack:password@10.60.11.22:5672

[oslo_policy]
policy_file=C:\Program Files\Cloudbase Solutions\OpenStack\Nova\etc\policy.json

[oslo_concurrency]
lock_path=C:\OpenStack\Log\

[glance]
debug = False
api_servers=http://10.60.11.21:9292,http://10.60.11.22:9292

[hyperv]
vswitch_name=br-ex
limit_cpu_features=true
config_drive_inject_password=false
qemu_img_cmd=C:\Program Files\Cloudbase Solutions\OpenStack\Nova\bin\qemu-img.exe
config_drive_cdrom=true
dynamic_memory_ratio=1
enable_instance_metrics_collection=false

[rdp]
enabled=true
html5_proxy_base_url=http://10.60.11.25:8000/

[neutron]
url = http://10.60.11.201:9696

auth_strategy=keystone
project_domain_name=Default
project_name=service
user_domain_name=Default
username = neutron
password = password
auth_url = http://10.60.11.201:35357/v3
auth_type=v3password