You may need to check your external ID mapping for the Upsert block. Please review this link to the Scribe Online connector help which discusses the Upsert block: https://help.scribesoft.com/scribe/en/index.htm#sol/conn/sfdc.htm
For information regarding mapping an external ID or another ID field, see the section: Salesforce Connector As IS/MS Target > Upsert Operation
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