Invalid value passed for authtoken on Free Trial?

Invalid value passed for authtoken on Free Trial?

Hi there,

 

I am working as a programmer for a client who wants something added in his existing Zoho Books. I have made my own trial account for Zoho Books, so I will not mess up his, while testing. However, when I make an Api call from a third-party script with my authtoken and orgId, I keep getting an error. When I run his auttoken and orgId, it works just fine. I have been checking and checking, but I can't find why mine is not working. Is it because I am in a free trial? If so, is there a possibity to get access anyway?

 

The error I keep getting: {"code":14,"message":"Invalid value passed for authtoken."}

 

Can you help me, please?