Hi !
i’m looking for answers aswell regarding this topic, but i’d like to share with you some steps that i’ve done ( in my development Proof of concept ) in order to acheive the connection via an IDP OIDC.
In IAM i created an IDP ( choosing the OIDC standard ), i needed to have what’s called audience ( application id in the IDP side )
after that i associated a role to the audience in the IAM identity provider.
After that i connected to my IDP, and got a jwt token from it.
I did follow steps in the question in the Q&A : Users signin in Quicksight (via IAM Federation)
Hope it helps you a bit