When using Synchronized Data Sources with Marketing Cloud Connect, the Campaign Object may be missing from the Synchronized Data Source selection. You would generally see all other objects, but 'Campaign' is missing.
This is most often caused by the System User (formerly Tracking User) not being assigned as a 'Marketing User' in Salesforce. This is required to be able to synchronize the Campaign Object. For additional details, see our 'Who has access to Campaigns?' documentation.
Within the Classic UI:
Within the Lightning UI:
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