How to access Sales Order 'Item' via API

I have been working on connecting a report to a visualization software. The report has to do with Sales Orders. With Postman requests I can access up to the “api/resource/Sales%20Order” point with no issues.

However, when I try to access “api/resource/Sales%20Order%20Item”, it says ‘access to resource forbidden’. My admin’s token isn’t able to access it either.

How can I gain API access to that level? Because I want access to the ‘quantity per stock UOM’ column as it shows the accurate number of units without bringing in UOM conversion.

That’s the link - https://clouerp.my-domain.name/api/resource/Sales%20Order%20Item

Any help regarding this issue will be highly appreciated.

Thanks!