ASIN Conflict Issue

Hello

I’m trying to list a new product. It’s hair colour and each shade has it’s own unique EAN and part number, I’ve listed one (below) but now I’m getting the following message for the other shades. Ive tried to search for the ASIN below but I get nothing. Any help to a newbie would be very much welcomed.

The value ‘80004’ specified cannot be used as it conflicts with the value ‘8412261800015’ for ASIN Z in the Amazon catalogue. If this is ASIN ‘B00U93165Q’, update the value to match the ASIN data. If this is a different product, update identifying information (UPC/EAN/Part Number/etc).

Thanks in advance.