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Set the S4SMapping.EnableDuplicateAllowSave configuration to ‘true’ in configuration in \App_Config\Modules\S4S\S4S.config:
Code Block language xml <!--Overide duplicate rules to create new object --> <setting name="S4SMapping.EnableDuplicateAllowSave" value="false"/>
Configure the S4S Experience Forms error handling to email form values to enter manually into Salesforce so the duplicate rules can be applied. See the following link for more information - Error Handling
Create a custom submit action and implement code to process the Salesforce record matches that are returned in the FailedSaveResults collection. See the following code sample for more information - Working with Salesforce Duplicate Rules
Next Step
Congratulations, you have finished installing this option.