The Stax Accounts service has been uplifted to improve core operating processes.

This change decreases the time taken to provision new Stax-managed AWS accounts, and improves the reliability of this process. Additionally, the Security Foundation Account now manages Amazon GuardDuty members via AWS Organizations, instead of individually by invitation. This change to the Amazon GuardDuty configuration is in alignment with the latest AWS offerings and recommended best practices.

You don't need to do anything to take advantage of these improvements. Next time you create a new AWS account using the Stax Console, API, or SDK, the upgraded Accounts service will be utilized.

(https://support.stax.io/hc/en-us/articles/4453778959503-About-Accounts)