Investigating IAM Incidents in AWS: Preparation - Question 7

For the question: 

The ‘MetrolioQA’ IAM role in your account grants write access to a ‘metrolio’ role from another account. What is the full name of the external principle? I can't seem to find insight onto the role. I am wondering about what is the location of the GUI I should be looking into more of.

I have mostly been digging throughout the csv download for any possible insights as well as the IAM access analyzer but I cant seem to get any good leads. Done through the MetrolioIAMAnalyst AWS role account.

Summary: I am wondering if there is any direction that can be provided in which I can look into more for finding external principles.