Carnival Gold to MSC Silver.
I filled out the form online for myself with no cruise booked. We booked a cruise a few days later and my status automatically showed as Silver.
I then filled out the form and submitted for DH…. His was approved within 24 hours and he was updated on MSC as silver.
I attached a screen shot from Carnivals site for each of us showing our status.
Hope this helps!
Steph