It is insane to NOT include this in the Exchange/M365 Admin. Writing a blogpost to announce a change that will have drastic impact on potentially a lot of customers is not sufficient - judging from the other comments here.
Why in the world would you NOT make this a notification somewhere in the Exchange/M365 Admin. At least implement a check that checks the Organization Level settings and give you an alert via mail/notification in case you are affected.
Utterly insane. What is even more insane is NO support team knew about this change. 3 Days of pushing around tickets with no meaningful help when it could have been solved in literally 1 Minute if they just linked us this article.
What a sh*tty day to work as a microsoft Sysadmin. Thanks for nothing.