Google Ads has published a new help page on a feature called Multi-party approval, which adds an extra layer of security to account management.
The feature requires a second administrator to approve high-risk actions like adding or removing users or changing user roles.

When a sensitive change is started, a request is created automatically. All other eligible admins will see an in-product notification. One of them must approve or deny the request within 20 days. If no action is taken, the request expires and the change is blocked.
Each request shows one of three statuses: Complete, Denied or Expired.
Admins can manage these requests under Access and security in the Admin menu.
Full details are available in the help page found by Hana Kobzová here: About Multi-party approval for Google Ads.