App Store > Microsoft 365 (previously: Office 365)
Hub (Announcement center)

What is the Hub?
The Hub, previously called ‘Announcement Centre”, is part of Workspace 365, which makes it easy for you, as an administrator or communication manager, to send notifications within the digital workplace.
You can send announcements to an individual, certain groups or your entire organisation. You can use it to send texts, but also images and even videos and links.
Choose whether you want it to appear as a announcement in a list or carousel or as a pop-up. You can also set which other people (e.g. team leaders or supervisors) in your organization have permission to create and send notifications.
Sources
Website
Support documents
Related articles