You are a Security Administrator at your organization.

Use Identity and Access Management (IAM) to restrict access of all users and service accounts that have access to the production environment.

Use organization policy constraints/iam.disableServiceAccountKeyCreation boolean to disable the creation of new service accounts.

Use organization policy constraints/iam.disableServiceAccountKeyUpload boolean to disable the creation of new service accounts.

Use organization policy constraints/iam.disableServiceAccountCreation boolean to disable the creation of new service accounts.