Snapshots with Quiesce?

I'm wondering if someone can help me, or even if this is supported. I'm relatively new to KVM Snapshots.

 

I have tried this on

• Windows Server 2016
• Windows Server 2012 R2

 

Things I have tried:

virsh domfsfreeze DC1

This command gives me:

Froze 2 filesystem(s)

But in Windows, I see events such as:

Event ID 8:

The flush and hold writes operation on volume C: timed out while waiting for a release writes command.

Event ID 12293:

Volume Shadow Copy Service error: Error calling a routine on a Shadow Copy Provider {3629d4ed-ee09-4e0e-9a5c-6d8ba2872aef}. Routine details CommitSnapshots [hr = 0x80004004, Operation aborted]. 
Operation:
   Executing Asynchronous Operation
Context:
   Current State: DoSnapshotSet

Event ID 12340:

Volume Shadow Copy Error: VSS waited more than 40 seconds for all volumes to be flushed.  This caused volume \\?\Volume{f610b574-cfcc-40c7-8aa2-5be2d28b8525}\ to timeout while waiting for the release-writes phase of shadow copy creation.  Trying again when disk activity is lower may solve this problem. 
Operation:
   Executing Asynchronous Operation
Context:
   Current State: flush-and-hold writes
   Volume Name: \\?\Volume{f610b574-cfcc-40c7-8aa2-5be2d28b8525}\

Event ID: 8194:

Volume Shadow Copy Service error: Error calling a routine on a Shadow Copy Provider {3629d4ed-ee09-4e0e-9a5c-6d8ba2872aef}. Routine details CommitSnapshots [hr = 0x80004004, Operation aborted
]. 
Operation:
   Executing Asynchronous Operation
Context:
   Current State: DoSnapshotSet

 

I also tried

virsh snapshot-create --quiesce DC1

Which gave me:

error: Flag 'VIR_DOMAIN_SNAPSHOT_CREATE_DISK_ONLY' is required by flag 'VIR_DOMAIN_SNAPSHOT_CREATE_QUIESCE'

Google has failed me here. I'm just after a snapshot of the VM that Quiesce's the guest! Has anyone had any luck with this before? VSS is giving me hell, and I realize that's a Windows problem but I have never had this kind of issue in VMWare or Hyper-V before. Am I doing something wrong? 

 

I have guest agent v7.3.2 installed, I have tried earlier versions as well, to no avail. Is this just not possible/supported? 

 

Thanks in advance.