More detail
Assign the AdministratorAccess permission set to ryan in Prod, and Identity Center creates a role in Prod with that policy and lets ryan assume it.
A reusable bundle of permissions that Identity Center turns into a role in each account you assign it to.
Think of it as: A job description that comes with the right keys in every building.
Assign the AdministratorAccess permission set to ryan in Prod, and Identity Center creates a role in Prod with that policy and lets ryan assume it.