The request to list features available on the specified server failed

[Bibster90]

Hello, everyone,
as nobody can help me in the german forum, I try my luck here.

I can't install any more features on a Windows Server 2012 (GUI).

In the GUI I get the following error message: The request to list features available on the specified server failed.

In Powershell I get the following message:

install-windowsfeature : Fehler bei der Anforderung zum Auflisten der auf dem angegebenen Server verfügbaren Features.
Führen Sie die Anforderung zu einem späteren Zeitpunkt erneut aus.
In Zeile:1 Zeichen:1
+ install-windowsfeature windows-server-backup
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : ObjectNotFound: (@{Vhd=; Credent...Name=localhost}SObject) [Install-WindowsFeature], D
eploymentProviderException
+ FullyQualifiedErrorId : Provider_GetWmiClass_Failed,Microsoft.Windows.ServerManager.Commands.AddWindowsFeatureCo
mmand

SFC /scannow did not produce any results. Also various DISM commands did not lead to success. Neither with the installation DVD as source nor with an unpacked image.

Strangely enough, when entering

Dism /Online /Get-Features

I get only one package displayed (Microsoft-Windows-ServerCore-Package~31bf3856ad364e35~amd64~~6.3.9600.16384) with the note that no features for this package were found.

For example, if I type
dism /online /get-featureinfo /featurename: windows-server-backup
, I get "Error: 0x800f080c

The feature name "windows-server-backup" is unknown.
A Windows function name was not recognized." back.

Unfortunately, I don't know what to do and am grateful for every thought.

Thank you very much
Bjorn

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