If you try to install the SCOM agent on a SharePoint server that already has the SCSM self-service portal installed, the install of the SCOM agent will fail. To resolve this the only option is to uninstall the SCSM self-service portal then install the SCOM agent and reinstall the SCSM Self-service Portal.

Since most of the configuration for the self-service portal is stored in the SCSM database this process can be done fairly easily as long as you have not done any major modifications to the self-service portal and where having a well-documented change process in place comes into play.
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