VMM cannot complete the Hyper-V operation on the %ServerName; server because of the error: User Account does not have sufficient privilege to open attachment (path to ISO file)
Error: 'General access denied error' (0x80070005).
(Unknown error (0x8001))
Resolve the issue in Hyper-V and then try the operation again.
Some applications and APIs require access to authorization information on account objects
How to Enable Shared ISO Images for Hyper-V Virtual Machines in VMM
1. Add the Hyper-V hosts to the "Windows Authorization Access group".
b. Select the Built-in container
c. Select the Properties of the Windows Authorization Access group
d. Select the Members tab
e. Add the computer object for the Hyper-V host to this group