is there a service role that needs to be attached to AWSCodeCommitPowerUser policy for codecommit , we are integrating with Jenkins and with only policy the code /repo is not getting checked out

Got started with creating a repo using codecommit , respective users (IAM) with needed policy AWSCodeCommitPowerUser. Also have integrated Jenkins in aws ec2instance using the security credentials of the IAM user. The issue is that code is not getting checked out. There is a old post on code commit integration with jenkins https://aws.amazon.com/blogs/devops/integrating-aws-codecommit-with-jenkins/ (mentions service role tagging with policy) however there is no mention of the same in the current info center