Currently Teams channel banner notifications (the ones that popup on the desktop - unless these are the feed notifications) do not provide a preview of the message that has been posted in the channel. Even if you @ a user from within the channel this is the case.
Private conversations or group conversations however do show the preview message but lack many features that are available within Teams channels.
Is this an option perhaps within Azure, or an option not currently available? Either way - this needs to be added at minimum to the channel/team owner's settings to modify. We have a large user base and is a primary reason for using group conversations. It unfortunately means often having 2 separate conversations going for the exact same group: 1 as a group chat, 1 as a Team's channel.
Please let me know if there is a way to configure this. If it requires Admin rights, that's fine. We can always submit the request to our Managers/Admins but we likely will have to tell them where the options are and how to configure them.