Issue in creating label using API.

Hello,

I made a request on the below API endpoint and I have received a response successfully.

But, there are some points I want the answer.

When I request API with a sandbox access token it's giving me a response with a blank label URL.
it means when I open that label URL it shows me black screen/invalid PDF format. and also it will not show in the Easyship dashboard.
When I request API with the production access token, it's giving me a response with the Null label URL. and it will show shipment in the Easyship dashboard.

can you please look into this issue.?

Thank you,
//Sagar J.