Enterprise Announcement
If you have access to Breakroom Enterprise, you can send mass announcements to your entire company. Open the "Breakroom Enterprise" portal and click on "Announcements". You can also send an enterprise announcement to a subset of your company

Require Acknowledgement & Analytics
You can choose to turn on "Require acknowledgement". With this turned on, a "confirmation" button will show for each team member. You can then keep track of how many team members have seen and acknowledged your Enterprise Announcement

Send Enterprise Announcements on your phone
If you have access to Breakroom Enterprise, you can send enterprise announcements on your phone by clicking on "Announcements" > click on the "+" icon on the left side and select "Enterprise Announcements"

How does Breakroom compare with other alternatives?
Breakroom as a Crew App Alternative
Breakroom as a Slack Alternative
Breakroom as a When I Work Alternative
Breakroom as a Homebase Alternative
Breakroom as a Microsoft Teams Alternative