Ohh darn it! This is so frustrating! I’m so sorry you are going through this.
‘Seller Support’ is not very supportive hey!? Have you called SC? I would always call and attach the PDF to the call when you get connected. There appears to be a block somewhere and you need someone to tell you what is the missing piece of information that is causing this block.
As they suggested re-adding the product, you ‘may’ need to delete the listing and re-add it and attached the PDF we talk about in step 4. BUT call them first and ask to be put through to the catalog team to resolve this today.