Custom Geoprocessing registered in Portal can't be executed in ArcGIS Pro

Question

Hello,

I've created a small GeoprocessingService that pulls data from an external service and returns a GPFeatureLayer.

This way results are rendered well in Pro and I was able to publish this Service to our ArcGIS Server as private. Next I registered the service to our portal with some user providing credentials to private service => worked.

Now I open ArcGIS Pro and sign in to Portal with the same user. I see the Tool in my contents but I can't execute the tool. If I double click the tool, no form with input fields opens up, just an empty panel.

How can I troubleshoot this?

Thank you for your help!

RichardReinicke · Accepted Answer

The problem was I registered the GPService item with a url like:
/MyGpService/GPServer/MyTool

This way it also asked for credentials and created the item but following toggle-button was not active:

I had to use url of the service level item:
/MyGpService/GPServer