I am trying to work with AWS Elemental MediaPackage and AWS Elemental MediaLive. I'm have a good amount of experience with AWS and IAM Roles. I've attached a Full Access policy for both services but somehow I still do not have access. I'm trying to figure out what I am missing.
The error is not about your IAM user permissions which you've posted in the question. The error is about some IAM role which does not have necessary permissions.
Since you removed the name of the role from the first screenshot, I can't comment which role is it exactly. So you have to go to the role in IAM console, and add the permissions missing which are also listed in the error message.