Struggling with automatic AWS account creation in Terraform Cloud


I’m kind of struggling with an interesting issue. We have let’s say one ‘master’ Terraform Cloud Workspace that talks to AWS Control Tower to rollout new accounts in our org, this works fine. In order for teams to deploy to those accounts we create a new Terraform Workspace for them with a brand-new repo, fine. But now, in order to let that new workspace deploy to the new AWS account, we need to setup aws_access_key_id & secret_access_key_id in the environment variables. The question is, is there a way to automate that part, link the new Terraform Cloud to the new AWS account without manual steps?
Anyone that fixed this or experienced this?

Thanks so much in advance.