Predictive Analysis - User Issue - Microsoft Fabric Community

I'm having a problem with power BI's predictive analytics functions. We're able to train models without any apparent issues, but the system struggles to apply these models and generate predicted values. Some members of the team can get past the errors that are flagged up at this stage, by clicking on the warnings that appear in the bottom-left and pressing continue. These manageable errors are always about revealing data from one source to another. Other team members run into issues that appear to be related to their login credentials, which we've not yet managed to solve. Also, the team members who could previously run models are starting to run into the same problems.

Are there different ways of loading in the data that might get around the credentials problem?