I hate creating listings on Amazon, there is nearly always something wrong and quite often I am told at the end after spending a long time creating a complex listing with variations. Then most of the time Seller Support is clueless or give you the wrong solution.
Often I get strange error messages when creating a listing for a product with an EAN that is not in the Amazon database. The most common one is that the newly created ASIN clashes with another ASIN (normally a completely unrelated product) and I am supposed to change title and description to match this other product! This morning I was told I can upload a maximum of 0 images which means my listing will be search suppressed. Then I am no longer allowed to list products from a manufacturer although I have asked (again) permission to do so and that was granted last month. On top of that, I am now not even allowed to list my own brand and I am supposed to ask permission again. Also the form is heavy and slow, even with my laptop which is pretty fast.
No problem whatsoever when listing on eBay, Etsy or you name it. This is so time consuming and soul destroying. I know I am talking to a wall but I have to vent a bit.