My sandbox token is not working

[cclu6429]

While I am testing UploadSiteHostedPictures api in sandbox, it requries my sanbox token.

I go to Home -> User Tokens (eBay Sign-In) -> select sandbox -> Get OAuth Application Token, and generate a fresh new token. 

While I am using the token together with sanbox appId, certId,devId in the api call to eBay, it returns "

Validation of the authentication token in API request failed". 

It seems that the eBay sandbox token system is broken. Anyone can help? Many thanks

[developer_support@ebay]

Hi @cclu6429 

OAuth Application Token is not a valid token for Trading API calls. Trading API calls like UploadSiteHostedPictures requires the user access token for authorizing the calls. You can either use Auth`n`Auth user access token or  OAuth User access token for executing the Trading API calls. 

Making a Trading API Call: https://developer.ebay.com/devzone/xml/docs/Concepts/MakingACall.html

Getting User access tokens via the Developer Portal: https://developer.ebay.com/api-docs/static/oauth-ui-tokens.html#user