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Import the attached Flow Studio flow. (end of the document).
Refer, 3.3.3 Importing and Exporting Flows
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Copy the Flow Studio ID
Copy the Control id of the Control named Email confirmation.
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Import the attached Experience Designer flow (end of the document). Refer How do I export and import flows in Experience Designer
Paste the Flow studio Id in the function node named Flow studio Id
Paste the Email confirmation Control Id in the function node named Capture email id.
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