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This error occurs when a Lead in Salesforce has already been converted to a Contact (and sometimes an Account or Opportunity) before the referral sync tries to reference it. Once a Lead is converted, Salesforce blocks API actions on the original Lead record.
How to fix it
- Search for the user by email in Salesforce.
- Check whether the Lead record has been converted to a Contact.
- If it has, the original Lead can no longer be updated via the API.
How to prevent it
- Ensure Leads are not converted before the referral process completes.
- If your sales team regularly converts Leads quickly, consider configuring Referral Factory to create Contacts instead of Leads in your integration settings.