Mentioning Team vs Mentioning Channel

Hello Sifiak 

Users will now only be notified about personal and tag mentions from hidden channels. 

If your team is not large, consider creating tags. Adding members to a tag is a one-time action, but team owners or admins must update the tag for new members. Members of this tag will receive notifications from hidden channels.

For example, you can create an "All team" tag for posts.

I hope you find this helpful.