Patch Operation not working - SAP Build process automation

Hi Experts,

Need a help. We are trying to update a on-premise Product data using patch operation of standard API.

https://api.sap.com/api/API_PRODUCT_SRV/resource

We are using SAP Build-Process automation. We have created action in SAP Build.

We are calling that action through SAP Build-Process automation as below:

When through the workflow, the action is triggering, it gives an error as below:

I have checked and it is passing through the cloud connector. Can you please suggest if we are doing anything wrong.

Thanks

Tirthankar