HRESULT 0xC03A0016 (ERROR_VHD_PARENT_VHD_ACCESS

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Description:

The chain of virtual hard disks is inaccessible. The process has not been granted access rights to the parent virtual hard disk for the differencing disk.

Could be also:
Constant	Type	OS
STATUS_VHD_PARENT_VHD_ACCESS_DENIED	NTSTATUS	Windows

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ERROR_VIRTDISK_NOT_VIRTUAL_DISK	ERROR_VHD_CHILD_PARENT_SIZE_MISMATCH

ERROR_VHD_PARENT_VHD_ACCESS_DENIED

ERROR_VHD_PARENT_VHD_ACCESS_DENIED means the child VHD/VHDX found its parent path but the process opening the chain did not have the required access to the parent file.

What to check

Confirm access for the Hyper-V host and service context, not only for the interactive administrator account.
Check NTFS/ReFS and share permissions on every parent directory in the chain.
Look for an antivirus, backup, replication, or another Hyper-V process that has locked or redirected the parent file.

Microsoft: Get-VHD

Microsoft: Hyper-V antivirus exclusions

Microsoft: Set-VHD

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