TLDR: Microsoft has acknowledged a case where EnableLinkedConnections will fail to work. This will occur if UAC requires a password before running an elevated program (ie running as admin).
This issue occurs when the following conditions are true:
You use Group Policy Preference (GPP) or logon scripts to map network drives during logon.
User Account Control (UAC) is enabled.
The following UAC Group Policy setting is configured to Prompt for credentials:
- User Account Control: Behaviour of the elevation prompt for administrators in Admin Approval Mode
The EnableLinkedConnections registry entry is configured. See the detail to configure the registry entry.
Under these conditions, you experience the following situation:
- When you log on, mapped drives are available as expected.
When you run an elevated command prompt as administrator, the mapped drives are unavailable in the elevated command prompt.
Note This issue also affects other applications that run in an
elevated context (run as administrator) and use drive letters to
access mapped drives.
When UAC is enabled, the system creates two logon sessions at user
logon. Both logon sessions are linked to one another. One session
represents the user during an elevated session, and the other session
where you run under least user rights.
When drive mappings are created, the system creates symbolic link
objects ("DosDevices") that associate the drive letters to the UNC
paths. These objects are specific for a logon session and are not
shared between logon sessions.
Note The EnableLinkedConnections registry entry forces the symbolic
links to be written to both linked logon sessions that are created,
when UAC is enabled.
When the UAC policy is configured to Prompt for credentials, a new
logon session is created in addition to the existing two linked logon
sessions. Previously created symbolic links that represent the drive
mappings will be unavailable in the new logon session.
To work around this issue, follow the steps in one of the following
In Local Group Policy Editor, locate the following Group Policy
Local Computer Policy\Windows Settings\Security Settings\Local
Configure the following policy to Prompt for consent:
Control: Behaviour of the elevation prompt for administrators in
Admin Approval Mode
Map the required drives again in the elevated session, for example, by
using a .bat script file.
Microsoft has confirmed that this is a problem in the Microsoft
products that are listed in the "Applies to" section.
A link to a similar bulletin was provided in a comment above, but didn't seem to be for English language users; the link in this answer should be for English locale.