When you try to remove a vhd file or a vhdx file by using Hyper-V Manager in a Windows Server 2012-based Hyper-V virtual machine, the following Error event is logged in the event log:
Log Name : Microsoft-Windows-Hyper-V-VMMS/Admin
Source: Hyper-V-VMMS
Event ID: 15090
Level: Error
Message: 'VM Name' failed to modify resources. (Virtual machine ID 'VM GUID')