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We can make use of Salesforce Screen Flow for Experience Cloud Site Guest User.
Sample Flow:
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1. Go to Flows in Salesforce Setup.
2. Select “Edit Access” from the flow actions.
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3. Enable “Override default behavior and restrict access to enabled profiles or permission sets”.
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5. Give Flow Access to the Guest User profile.
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6. If the flow has DML operation, make sure the Guest User profile have access to that object.
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Output:
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