Cause
The error occurs because you might not have the following roles as a Patch Designer or a Patch Operator:
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ORACLE_PLUGIN_USER, to view the plug-in user interface
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ORACLE_PLUGIN_OMS_ADMIN, to deploy a plug-in on the OMS
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ORACLE_PLUGIN_AGENT_ADMIN, to deploy a plug-in on the Management Agent
These roles are required to submit the Discover Promote Oracle Home Targets job. The job deploys the Oracle home plug-in on the Management Agent if it is not already deployed.