Back in March 2021, we introduced the new Microsoft 365 Defender portal (https://security.microsoft.com) to our Microsoft Defender for Office 365 customers, offering a consolidated user-interface tha...
Updated Aug 04, 2022
Version 2.0
Blog Post
Also, it's alive because Defender is broken. You can't create mail loop alerts in Defender, but you can in Protection, and this is in March of 2022. Now Defender redirects you to Onboard when you're trying to get to alerts.
Such a mess.