To access TikTok (international) while using v2rayNG, which by default is set for (Chinese) Douyin, follow these steps:
- Open the left-hand menu in v2rayNG.
 - Select Settings.
 - Go to Custom rules.
 - Select PROXY URL OR IP.
 - Enter exactly geosite:tiktok.
 - Save your changes using the button at the top of the screen.
 - Go back and reconnect v2rayNG.
 
Make sure to enter geosite:tiktok precisely as it is listed, not as geosite:tiktok.com or any other variation.