After you publish the collection, it shows up in Products & Subscriptions in the Portal. But you can't publish the collection because -- I suspect -- the Publication Date of the migrated folio is set in the near future. I believe that's why you can publish a migrated collection the following morning. Check the Publication Date setting in your Woodwing environment. Of course, I could be off the mark here, but it is a possibility.
I would guess that this is a Publication Date issue. In DPS 2015, you cannot publish a collection associated with a Product that has an Availability Date set in the future. Check the Availabilty Date settings for the migrated Product IDs.