40002 Invalid Access Token

The access token you're sending in the `Access-Token` header is expired, revoked, or was never valid to begin with. TikTok access tokens have a 24-hour lifespan by default.

What causes this error?

The access token you’re sending in the Access-Token header is expired, revoked, or was never valid to begin with. TikTok access tokens have a 24-hour lifespan by default.

How to fix it

1. Refresh your token: Use the /oauth2/access_token/ endpoint with your refresh token to generate a new access token.
2. Check token storage: Make sure your code isn’t accidentally truncating or modifying the token string when storing it.
3. Verify app credentials: Confirm that the app_id and secret used to generate the token match your registered TikTok developer app.