I know how to follow the migration guide to upgrade a classic load balancer to an application load balancer.
However, when I try to clone my Beanstalk environment and perform that migration on that environment, then it still shows as a "Classic" load balancer in the "Configuration" of the environment.
How can I migrate from Classic to Application when using Elastic Beanstalk?
Well, AWS ELB migration is not possible after creation of your environment as per AWS.
And here is the details link you can read AWS ElasticBeanstalk ELB Details