Just got this email myself:
Hello,
As part of our ongoing efforts to provide the best possible customer experience, we have implemented additional restrictions for Textbook products. Effective 2/26/2024, you will not be able to list the affected products, and your listings will be removed. This action does not impact your account health.
How do I reinstate my listings?
You are not approved to list Textbook products and we are currently not accepting applications.
Were your listings removed as a result of an error?
If you believe your products have been misclassified within a certain category or sub-category that requires approval, please contact Selling Partner Support with evidence, such as product pictures, to support this claim. Amazon will review your claim and make a final determination that will ensure the best shopping experience for our customers.
What happens if I do not take action?
If no action is taken, the affected listings will not be available for sale in the Amazon store.
Can I sell my remaining FBA inventory?
If you have remaining inventory of the affected products in Amazon fulfillment centers, you may continue selling your remaining inventory until 2/26/2024. After this date, you will need to create a removal order. For help in creating a removal order, see the following Seller Central help page:
https://sellercentral.amazon.com.br/gp/help/200280650
We’re here to help
For more information about products that require approval, search for Categories and Products Requiring Approval in Seller Central, or see:
https://sellercentral.amazon.com.br/gp/help/G200333160
Sincerely, Seller Performance Team https://business.amazon.com/abredir