QuestionOnCodeCommit

I believe AWS stopped onboarding new customers to CodeCommit. That's most likely why you have to be an existing user to be able to create repositories.

Jeff Barr from AWS tweeted about it here: https://x.com/jeffbarr/status/1818461689920344321

After careful consideration, we have made the decision to close new customer access to AWS CodeCommit, effective July 25, 2024. AWS CodeCommit existing customers can continue to use the service as normal. AWS continues to invest in security, availability, and performance improvements for AWS CodeCommit, but we do not plan to introduce new features.

https://aws.amazon.com/blogs/devops/how-to-migrate-your-aws-codecommit-repository-to-another-git-provider/