Documentation: Unable to Push SCOM Agent in Windows Server 2012

To solve this issue, you have to make sure that Microsoft .NET Framework 3.5 is installed or enabled.

To install or enable Microsoft .NET Framework 3.5 in Windows Server 2012, please follow the steps below:

1. Insert or mount the Windows installation disc into the server
2. In Server Manager, click Manage and then select Add Roles and Features to start the Add Roles and Features Wizard.
3. On the Select installation type screen, select Role-based or feature-based installation.
4. Select the target server.
5. On the Select features screen, check the box next to .Net Framework 3.5 Features.
6. On the Confirm installation selections screen, a warning will be displayed asking Do you need to specify an alternate source path?.

7. Click the Specify an alternate source path link to specify the path to the D:\Sources\SxS folder on the installation media in Step 1 and then click OK.

8. After you have specified the alternate source, or if the target computer has access to Windows Update, click the X next to the warning, and then click Install.
9. You should now see this under your Features list: