AWS AssumeRole authorization not working

Question

I am attempting to call the AssumeRole function using AWS sts in my PHP program since I want to create temporary credentials to allow a user to create an object for an AWS b

Answer 1

I had the same error and spent hours trying to fix it with permissions and trust relationships... but that was not my problem.

I was following this tutorial and I deployed the cluster in US West (Oregon) as specified.

To make it work, I needed to activate STS for this region here.