Create a saved configuration in Team A's account and configure it to Export. Now, log into Team B's account and choose the Import option. Here, you need to specify the name of the saved configuration and allow the system to create the new application. This takes a little time based on the Regions the two accounts belong to

Create a saved configuration in Team A's account and download it to your local machine. Make the account-specific parameter changes and upload to the S3 bucket in Team B's account. From Elastic Beanstalk console, create an application from 'Saved Configurations'

Create an export configuration from the Elastic Beanstalk console from Team A's account. This configuration has to be shared with the IAM Role of Team B's account. The import option of Team B's account will show the saved configuration, that can be used to create a new Beanstalk application

It is not possible to migrate Elastic Beanstalk environment from one AWS account to the other