AWS ALB Ingress has no host address and class is empty

Question

I have followed the AWS official document to create an ALB controller and made sure few things like providing aws region and vpc id when creating a controller.

https://docs.aws.amazon.com/eks/latest/userguide/alb-ingress.html

However I notice the below error in the ALB contoller pod logs. I am running the controller pods and other resources in Fargate nodes with AKS running on version 1.21.0

{"level":"error","ts":1643650856.9675832,"logger":"controller-runtime.manager.controller.ingress","msg":"Reconciler error","name":"app-ingress","namespace":"backend","error":"WebIdentityErr: failed to retrieve credentials\ncaused by: RequestError: send request failed\ncaused by: Post "https://sts.us-east-1.amazonaws.com/": dial tcp: i/o timeout"}