Mike,
This should happen automatically if the method suer is linked to a QB Entity that has rep initials. Can you confirm that the user who is logged in that is created the lead is associated?
This can be done in Method by going to Customize>>>Users. Edit the user and in step 1 ensure there is a selection for the option that reads "Link to Employee / Vendor / OtherName (SalesRep):"
Something tells me that should help you out.
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