We use Discord, and have 2 channels for each game we're workin' on. 'Updates' and 'Chat'

Announcements you want everyone to see go in 'Updates' So if you finished a feature or are starting work on a feature, or have a doc to show everyone... ... Everyone working on that project will have notifications turned on for the projects 'Updates' channel and will read everything on it.

All general chat about the project and also responding to and chatting about stuff in 'Updates' channel happens in chat channel.