Machine learning AIFunctions Authentication failed for all authenticators

Hi, I'm getting an "Authentication failed for all authenticators" for data source "AIFunctions" when I try to train a data flow machine learning model for 60min. But it works fine if I set it to train for 5 minutes.

What could the issue be? Is it that the authorization to AIFunctions (which is set to OAuth, logging in with my account) that times out after a while? What is the solution then?