There are two ways to resolve this issue, both of which involve giving the Salesforce-Account Engagement connector user more visibility into lead and/or contact records.
Method 1:
Give the Salesforce-Account Engagement connector user 'View All Records' object permissions for the lead and contact objects. This will ensure that the connector user can view all lead or contact records in the Salesforce org. This will prevent steps 3-7 in the above timeline.
Method 2:
If the Salesforce org's Organization-Wide Defaults are set to 'Private' for lead and contact records, then use Sharing Settings to give the Salesforce-Account Engagement connector user to extend access to the appropriate set of lead and/or contact records to prevent duplicate records from being created.
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