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Amazon error 8541: Your data conflicts with an existing ASIN

What does it mean?

The product ID matches an ASIN in Amazon's catalogue, but attributes such as brand, title or colour differ from what Amazon has. The message shows your value next to Amazon's.

How to fix it

Accept Amazon's value, list against the ASIN directly, or correct the GTIN. If Amazon's data is wrong, open a Seller Support case with proof.

Where do you fix it?

More on this subject

Source

Summarised in our own words; Amazon's page is leading.