So there is a brand that we sell and all of a sudden we are getting lots of supressed listings saying that either the colour or size has not been provided (they have and it’s showing in seller central on the listing) and to fix it they are giving this message (see below) , problem is that the brand never registered on brand registry as they want nothing to do with Amazon, so where do I go from here trying to sort the issue out.

I’ve got a letter from the brand stating that we are an authorised seller of their products but can’t see anywhere that I can upload it to , to show that we are legit.

You are not authorised to fix this issue. A contribution from the brand owner or an authorised reseller is required to resolve this issue and activate the ASIN. If you are the brand owner or an authorised reseller for this brand, please apply for the appropriate role for this brand in Amazon Brand Registry.