We have set up Marketing Cloud Connect and have (for now) integrated our Marketing Cloud Instance with our Salesforce Sandbox. After we have taken care of everything for configuring the Connector, when we go to Data Sources in Contact Builder, for creating Data Sources from SF objects, we get to select the Objects that we want from an available list of SF objects.
Once we have clicked on 'Synchronise' the corresponding Data Sources are created from the SF objects selected, and subsequently the Synchronised DEs are also created.
We are getting the attached error for every Data Source created. 'Contacts Registration Failed' (pic attached).
Has anyone encountered this error?