Whether authorization is required to sell branded goods on eBay depends on the policies and requirements of the brand. Some brands require sellers to obtain authorization before selling their products, while some brands are more relaxed about sales channels.

For brands that require authorization, sellers need to apply for authorization from the brand before selling. After obtaining authorization, sellers can sell the brand's products on eBay and use the various resources and support provided by the brand. At the same time, sellers also need to comply with the brand's sales policies, such as price ranges, after-sales services, etc.

For brands that do not require authorization, sellers can sell directly on eBay, but they need to make sure that the goods sold are authentic and comply with eBay's relevant regulations.

In general, whether authorization is required to sell branded goods on eBay needs to be determined based on the requirements of the specific brand. It is recommended to understand the brand policy in advance before selling to ensure compliance with regulations.