Did you read through the "seller code of conduct" section in the participation agreement? Because it will be impossible to know what you did wrong, without to know what you are not allowed to do.

Seller code of conduct

This policy requires that sellers act fairly and honestly on Amazon to ensure a safe buying and selling experience. All sellers must:

Provide accurate information to Amazon and our customers at all times

Act fairly and not misuse Amazon’s features or services

Not attempt to damage or abuse another seller, their listings or ratings

Not attempt to influence customers’ ratings, feedback, and reviews

Not send unsolicited or inappropriate communications

Not contact customers except through Buyer-Seller Messaging

Not attempt to circumvent the Amazon sales process

Not operate more than one selling account on Amazon without a legitimate business need

Not engage in conduct that violates price fixing laws

Violating the code of conduct or any other Amazon policies may result in actions against your account, such as cancellation of listings, suspension or forfeiture of payments, and removal of selling privileges. More details about these policies are below.

Accurate information

You must provide accurate information to Amazon and our customers, and update the information if it changes. For example, this means that you must use a business name that accurately identifies your business and list your products in the correct category. As another example, your shipping settings and inventory data must accurately reflect your operations, including your shipping location(s) and shipping service selections.

Acting fairly

You must act fairly and lawfully and may not misuse any service provided by Amazon. Examples of unfair activities include:

Providing misleading or inappropriate information to Amazon or our customers, such as by creating multiple detail pages for the same product or posting offensive product images

Manipulating sales rank (such as by accepting non-authentic orders or orders that you have paid for, or refunded externally or orders that you discounted externally) or making claims about sales rank in product titles or descriptions

Attempting to increase the price of a product after an order is confirmed

Artificially inflating web traffic (using bots or paying for clicks, for example)

Attempting to influence search results by inflating search ranking through keyword manipulation or incentivizing customers’ searches to appear as organic behavior

Attempting to damage another seller, their listings or ratings

Allowing other people to act on your behalf in a way that violates Amazon’s policies or your agreement with Amazon

Ratings, feedback, and reviews

You may not attempt to influence or inflate customers’ ratings, feedback, and reviews. You may request feedback and reviews from your own customers in a neutral manner, but may not:

Pay for or offer an incentive (such as coupons or free products) in exchange for providing or removing feedback or reviews

Ask customers to write only positive reviews or ask them to remove or change a review

Solicit reviews only from customers who had a positive experience

Review your own products or a competitors’ products

Communications

You may not send unsolicited or inappropriate messages. All communications to customers must be sent through Buyer-Seller Messaging and be necessary for fulfilling the order or providing customer services. Marketing communications are prohibited.

Customer information

If you receive customer information such as addresses or phone numbers to fulfill orders, you may use that information only to fulfill orders and must delete it after the order has been processed. You may not use customer information to contact customers (except through Buyer-Seller Messaging) or share it with any third-party.

Circumventing the sales process

You may not attempt to circumvent the Amazon sales process or divert Amazon customers to another website. This means that you may not provide links or messages that prompt users to visit any external website or complete a transaction elsewhere.

Multiple selling accounts on Amazon

You may only maintain one Seller Central account for each region in which you sell unless you have a legitimate business need to open a second account and all of your accounts are in good standing. If any of your accounts are not in good standing, we may deactivate all of your selling accounts until all accounts are in good standing.

Examples of a legitimate business justification include:

You own multiple brands and maintain separate businesses for each

You manufacture products for two distinct and separate companies

You are recruited for an Amazon program that requires separate accounts

Watch the video below to learn how to address a violation of the multiple account policy:

Filing infringement notices as an agent or brand protection agency

Amazon understands that many brands may choose to have brand protection agencies or agents report intellectual property infringement on their behalf and accepts submissions from authorized agents. However, Amazon does not permit individuals with active selling accounts to file infringement notices as an agent of a brand when the filing of those notices could benefit their own selling account (through removing competing listings, for example). Any sellers filing notices as an agent to benefit their own status as a seller may have their selling account terminated.