AWS Cognito: An error was encountered with the requested page redirect_mismatch

My ECS Fargate instance is behind ALB (Application Load Balancer)

I use ALB to authenticate user who can access this Dev environment site.

Here is my previous redirect.

https://<ALB_DNS_PATH>

It’s not working.

Here is the workaround.

I append this path and it’s work

https://<ALB_DNS_PATH>/oauth2/idpresponse

Working !