To reproduce the issue in my environment, I created a VPC with a public subnet and a private subnet. Also I created an ES instance in the private subnet and an EC2 instance as Nginx server (with certs) in the public subnet. Then I setup cognito user pool and identity pool with Google federation.

I noticed that the request is redirected to Cognito login page again with message “something went wrong. Please try again” after Google login.

If I use native cognito (login with email: henry@example.com and password: henry111@@@) then the Kibana will be loading.

After confirming with AWS expert, the outcome is that currently federated OAuth with Google is NOT supported with Nginx for Kibana in VPC.