This is currently in Preview – planned to release very soon.
In the following weeks, Teams will be rolling out support on Safari 11+ on macOS. While in preview, there are known issues with Safari’s ITP mode and it is advised that users disable Safari’s Intelligent Tracking Prevention.
Hey Chris, I got into the Preview program somehow and my Teams are working in Safari just fine now. So I guess it will go public quite soon.
This feature request is still being reviewed. The team is working hard to make numerous changes with regards to notifications, but they haven’t forgotten about this item.
I hope to have more details soon.
For macOS, it's better to integrate them into standard notification system - https://microsoftteams.uservoice.com/forums/555103-public/suggestions/16941685-use-built-in-notifications-for-macos
They will be properly visible and controllable by users
We acknowledge the customer demand for Private Channels and have been hard at work on it. Private Channels is currently in preview with a select group of customers. We expect to release the feature to the public later this Fall, and will update here when we are starting to roll out to all customers. We appreciate all the feedback you have provided to us on this forum and thank you for your patience.