Hyper-V backup fails with error - "e0001606 - Access is denied"
Final error: 0xe0001606 - Access is denied (Hyper-V backup).
Final error category: Security Errors
For additional information regarding this error refer to link V-79-57344-5638
This can be caused by an issue with the VHD files on the Hyper-V server.
Try to move the VM to a different Hyper-V host. If that doesn't work then contact Microsoft for additional assistance.