Issue resolved!
As mentioned, the process needs to be designed as a background, cross-platform automation.
“Process Design: Ensure the process you are trying to execute was designed as a background, cross-platform automation.”
And it’s clearly stated in the documentation as well:
“A background, cross-platform automation project that has been published to Orchestrator and added to your folders.”
Thank you!
I was indeed trying to run a foreground process using a serverless robot — that was the issue.