Error Code: 8541 - This occurs when Amazon rejects the updated value of an attribute because it differs from the current value stored in their catalog. It is commonly associated with issues related to listing updates and product attributes such as Size or Style.
Instructions:
Title Error

To fix this issue, please add these attributes to your flat file:
- Product Type
- SKU
- Brand Name
- Product ID: Input the ASIN
- Product ID Type: Select “ASIN” from the drop-down menu
- Item Type Keyword

NOTE: As a refresher, please check our SOP on updating listings using a flat file.
Product Type Error

For this type of error, you have to create a ticket to Amazon Seller Support and have them fix this on their end. This is an issue on their system and not on the flat file that you uploaded.
Please review this SOP to be guided on how to ticket Amazon.