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When I looked into outbound integration found the below message
Enable Integration - Contact your Client Services Manager to Enable Integration.
To be allowed to set-up an integration between a CRM system (such as Salesforce) and Eloqua, you'll need to create a Service Request in support.oracle.com to have the Integration area enabled. Once you have received the CRM User Name and Password, you should be able to run the CRM integration setup in the Outbound tab.
If you're using Salesforce, please be aware that it's strongly suggested that a unique SFDC user be created exclusively for the on-going data exchange of this Eloqua integration.
Campaign Production Specialist