Protecting the agent machine. Error is produced: "Failed to open volume \\?\Volume{GUID}" (4040674)

When trying to protect new machine an error generated that says: "Failed to open volume '\\?\Volume{GUID}'"

You may also encounter error: "Failed to execute action for agent <agent_name>
System.InvalidOperationException depth 0: Sequence contains more than one matching element (0x80131509)"

To resolve the issue please perform the following on the agent machine:

1. Open CMD in "run as admin" mode and type diskpart.
   1. list disk
   2. select disk x (if there are more than 1 disk in the system)
   3. list partition
   4. list volume
   5. Type the following commands until the hidden partition is found:
      1. select partition (SRP)
      2. detail partition (partition should show "Hidden" in the last tab)
   6. After the hidden partition is found:
      1. Set Id=ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
      2. list volume
      3. select volume (where z is the volume with "Hidden" on it)
      4. attributes volume clear hidden
2. Protect the agent again.