We have an external process that generates an email (still Classic Content, but want to move to Content Builder), extracts the recipients from Salesforce, creates a data extension and sends to it.
What we can't figure out is how to create the IERs and sending records in Sales Cloud. The Marketing Cloud Bridge is configured correctly, and our UI-driven sends create the IERs.
SubscriberKey is set to the Contact ID.
Given there is [a checkbox in Journey Builder(https://salesforce.stackexchange.com/a/176537/23932) and another in Marketing Cloud Connector to "Send tracking data to Sales Cloud" and get the IERs created, is there a SOAP API field I have overlooked to enable this on our API call?