AIM Sold DL ads auto-generate once the following requirements are met:
property has been marked as sold
property has at least 3 photos
If one of the conditions wasn't met, you will need to amend accordingly and proofs will usually generate within 15 minutes of both conditions being met.
NOTE: Be aware - SOLD campaigns that are ordered as part of a DUO package are flexible and at ordering stage you can select a different property to the original property.