Douyin Best is an e-commerce platform owned by ByteDance and is very popular in China. However, there are several possible reasons why Douyin Best may not be found in the App Store:

1. Geographical restrictions: Douyin Best may only be available in certain regions or countries, so it may not be found in App Stores in other regions. Currently, Douyin Best is mainly available in China.

2. Translation and brand differences: Douyin may use different names and brands in different countries or regions. In some regions, another similar name or brand may be used to represent Douyin Best. Therefore, searching for Douyin in the App Store may produce different results.

3. Platform restrictions: Different App Stores may have different policies and requirements, and may have restrictions or review requirements for certain apps. This may result in Douyin Best not being found in some App Stores.

If you want to visit Douyin Best, it is recommended that you check Douyin Best's official website or get more accurate information and download links through ByteDance's official channels. Please note that applications should only be downloaded and used from official and trustworthy channels to ensure security and proper functionality.