The trials succeed when the cell in the notebook is executed manually:

However, the same process fails when executed as a Workflow:

 

The error simply says that there's an issue with the objective function. However how can that be the case if I'm able to successfully run the exact same code when I manually run the notebook cell? The notebook run fails when triggered through a Workflow run.

Unfortunately, changing compute cluster had no effect either.

Task fails with the following error: Exception: There are no evaluation tasks, cannot return argmin of task losses.