Comment and mention colleagues
Discuss an item internally with @mentions; clients never see comments.
Comments are internal: they are never sent to the client, whatever item they are on.
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Open the item and press Comment (or Add a comment in the action bar).

The comment box. -
Type your comment. Type @ and a name to mention a colleague; they get the comment in their Triage.
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Press Post, or Cmd+Enter (Mac) / Ctrl+Enter. Escape closes the box without posting.
Under the box, BMS says who can see the conversation, such as “Only you can see this conversation”. Give someone’s comment a Thumbs up to acknowledge it without replying.