Machine learning extractor error for custom model

I’am trying to test my custom invoice model deployed on cloud from local uipath studio.

My UiPath Studio version : 2021.4.4
My Document Understanding ML Skills version : 9.0

UiPath Studio is connected to Cloud Orchestrator via proxy and ml skills model is visible on “Machine Learning Extractor”. However when I click on “Get Capabilities” I get an error as below.

“An error occured while retrieving capabilities from server. Please check the logs for more details.”
But there are no logs neither on UiPath studio nor in Cloud.

Hey, @otim ,
Can you intercept the request with a tool (like Fiddler) and send it along with the response? The error from the print screen is vague and we cannot tell what causes this.