Send a message to all users (like a broadcast)

Thomas_Steibl Another option is InformaCast Fusion. You can find the app here:

https://appsource.microsoft.com/en-us/product/office/WA200000080?tab=Overview

InformaCast has an integration with Microsoft Teams and is built for both small and enterprise deployments. The best part is it can be deployed very quickly with little effort. Here's a link to an overview: https://www.singlewire.com/blog/emergency-notification/add-microsoft-teams

You'll need licensing so it does have a small cost associated with it. That said, it's the easiest and most scalable way of sending the broadcast to all Teams Users. The cool part here is when you license the Teams User you also license the user's desk phone, PC, and mobile device. So you can reach all of your users across all those devices simultaneously if you wanted. Additional functionality is available that allows for things like full-screen takeover on the PC, intrusive audio via their desk phone, SMS, Push, and more. You can of course trigger these notifications right from Microsoft Teams. It's a really cool app. I recommend checking it out.