I'm guessing there are plenty here that have created a MyDucati account, but did you certify your bike within your profile? I've created an account already and separately have contacted Ducati customer services via their online contact form with a query about my 899, but they've requested I certify my bike by emailing them a photo of my registration document and ID, the same two things MyDucati asks for to certify your bike. I know they're a real company, but I'm a bit wary about sharing such important documents with them. With the V5C I can blank out the document reference number, so they can see the information they need, but for the ID requirements, did you use your driving licence (front/back/both sides)?
I just scanned the V5 document which they accepted and acknowledged receipt of, didn't send driving licence as I remember