When trying to install Windows agents in SCOM 2012 R2, the task fails with error 0x80070002. Looking in the agent install log at
C:\Program Files\Microsoft System Center 2012 R2\Operations Manager\Server\AgentManagement\AgentLogs I see "OmAgentFunctions::InstallOmAgentMsi : MsiInstallProductW() failed. HResult: 80070643".
Instead of trying to push the agent from the SCOM server, try running the agent installer manually from the target server. The installer GUI may give you a better idea of why the install failed.
In my case the problem was that the System Center Advisor Agent was installed, which can not co-exist with the SCOM agent.
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