Changing a Brand from “Unknown”

We were unable to list a product because it was listed as “Unknown” brand. The brand for this item is clearly defined, you can see it in the photos, descriptions, etc.

I contacted Amazon to get it changed and they won’t/can’t do it. For some reason “Unknown” brands have to stay as “Unknown”.

Since we cannot list, it gives a monopoly over the item to the single seller on the page. Presumably, this is the same seller that incorrectly posted the brand as “Unknown” in the first place.

Any advice? Anyone else have this issue? Thanks!