I can't list my product

I got approved for my brand name to list on "Photo Frame" catalog but when adding my product, error 5461 appears saying "You may not create new ASINs for the brand: "MyBrandName"

If you believe the product you want to sell is not already listed in the Amazon catalog and should be listed as a new ASIN, submit an application"

I tried many times to submit this application but got declined with this message

"After further investigation, ASIN for the requested brand “MyBrandName” already exists on catalog.

If you are requesting a new brand and wish to register under the brand “MyBrandName” with PTD “FRAME”, please go through BR process – https://brandservices.amazon.com/brandregistry

If you do not wish to list under the requested brand name, please use the brand name as "Generic".

I need some help to know what i am doing wrong or don't understand so i can complete my listing.

Thanks