I would bet money this will be corrected in the near future. You will own a mistake. I would recommend you return it, and wait for the correction.
Do you really think Dometic is just going to continue selling this product into the market without this dual supply capability? Of course they are working to resolve it now. And they would love for customers caught up in their mistake to forget all about it. Even if I didn't have an immediate need for the capability, I would proceed with the refund process because if I later change fridges and sell this one, prospective buyers will be avoiding these early production units like the plague.
My main bug with this is that every other fridge and Dometic past models can be plugged in to both power sources at the same time, But I am so glad I went with ARB although they are also made by Dometic they are Streets ahead,
Why this issue was not picked up during field testing I don't know, A couple of years ago I saw another electronics company make the same mistake and now they are no more,
For the price of these new CFX3's A person could buy a National Luna or ARB or Engel, and have zero issues, I hate the fact they some brain dead person thought a Sticker was going to be the answer to everyones dreams and make it all better, Dometic ought to realize that this is a Global forum and this saga is not just an issue with US models but the fallout from this and how Dometic resolve this issue will effect sales Globally because many people know about this problem across the globe,
This needs a total recall not a limp wristed statement saying "IF" you are unhappy with it, The things don't work So Recall them, No Grey areas No Games, Just get it done, People will respect that and the Damage to the brand will be minimal.