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You can use the @username syntax only for users who have posted something in the comment discussion of that particular post. Or people who have edited the post. The OP is always notified. Mods can use a superping to ping users in chat for example even if they have never visited the room. If that is not solving the issue then it might be that they are using ...


3

First off, as you probably know, the @name syntax for pinging someone is only supported in comments. It has no special significance in questions or answers. Second, as Secespitus wrote, the user you are pinging must have interacted with the post you are commenting on. I don't think I've ever tried pinging someone who has merely edited a post; when I ping ...


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