If you are sending a message using the Message Composer, you may encounter an issue on the Audience tab where there is no option to select All Users:
Enable Setting in Composer Configuration
To show the All Users option in the Message Composer, navigate to Settings -> Feature Settings and click the Broadcast Push toggle to ON.
You should now see the option to select All Users:
- You can toggle the Broadcast Push setting to OFF to hide the All Users option when sending messages, if you do not want to have this option available to anyone using the Composer.