From Microsoft Corporation
MC221211, Stay Informed, Published date: Aug 31, 2020
We’re updating comment notifications for files in OneDrive and SharePoint.
This message is associated with Microsoft 365 Roadmap ID 66192
When this will happen:
We’ll be gradually rolling this out in early September and the rollout will be completed by mid October.How does this affect me?
Once available, this update willnotify document creators of new comments that other people have left in the file that they’ve created.
The experience will match the current experience for @mention notifications in Word, Excel, and PowerPoint as well as for notifications users receive when other people reply to their comments.
What do I need to do to prepare for this change?
You might consider updating your training and documentation as appropriate.