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Needs to be done with a live lead that exists in Marketo. If the lead exist in SFDC too, then the other part of the link will populate. The leads name is hyperlinked to Marketo and if in SFDC too, a hyperlink to SFDC detail. It also gives the campaign name that generated it and a time stamp.
Also, allow some time for the lead to enter SFDC, whnen the lead is generated then synced, add some wait steps to account for processing or it too may not populate.
Below is a screenshot of how it should look like once triggered by a form fill out: