I have downloaded the ASP.NET Core 2 sample app from Auth0 (https://github.com/auth0-samples/auth0-aspnetcore-mvc-samples/tree/netcore2.1/Quickstart/01-Login). Verified it works as expected locally and all is well.
When I deploy it to my Elastic Beanstalk site, the lock screen appears, but when I attempt a login I get this error
Heck - try it for yourself: http://tadspokerplanning-dev.us-east-2.elasticbeanstalk.com/
The login is recognized on my application dashboard. I just am not returned to the site in the correct state, it appears.
About the Elastic Beanstalk environment - it is very bare bones. No load balancer and no VPC. I am using http. I understand load balancers and otherwise multiple server architectures can produce this error, but I really don’t think that is what is causing this.