Summary:

Problem: 

Checkpoint cannot be removed from the Hyper-V Manager.

Symptoms:

• Hyper-V Manager shows a checkpoint.  No option to remove checkpoint.

• VM disk directory has VHDX and AVHD files:

Solution:

1. Use PowerShell to view existing snapshot:

PS C:\Users Get-VMSnapshot -VMName tfs.stevenjordan.net

VMName  Name    SnapshotType CreationTime           
------  ----    ------------ ------------          
tfs     tfs     (2/13/2018 - 2:52:36 PM) Standard

2. Remove VM-Snapshot.
PS C:\User Get-VMSnapshot -VMName tfs | Remove-VMSnapshot 3. Confirm Snapshot has been removed.

PS C:\Users Get-VMSnapshot -VMName tfs
PS C:\Users

That's It!