Amazon error 5461: You may not create new ASINs for this brand
What does it mean?
The brand is in Amazon Brand Registry and your account is not associated with it.
How to fix it
Apply through the link in the error; you can follow the status in Seller Central under your selling applications.
Where do you fix it?
- In Seller Central: application or setting
- 5665The brand name has not been approved by Amazon
- 5462You may not use this brand name for this ASIN
- 5661Possible misuse of the brand field
- 5995The brand does not match the brand in the catalogue
- 5561The attribute contains trademarked terms
- 5664Generic product policy
- 8572The product codes do not match the products you are listing
- 19098The ASIN has GTINs that do not match the brand
Source
Summarised in our own words; Amazon's page is leading.