Auth0 <--> AWS OpenID

Hey guys,
So I’ve set up Auth0.Lock 10 recently, on a web app, configured an AWS Federated Identity with OpenID and I’m receiving an AWS Authentication Object, with Token’s successfully… now how do I use these tokens to figure out which user is which, and provide access from the Auth0 user pool to the single AWS Federated Identity? I am getting users through to the AWS Federated Identity as sign-in’s… but there’s no way of me telling who is who or working out a way to provide access control to AWS resources?