Yes, this is the expected behavior. The 1-1 chats have an idea to be more private (between 2 users only) hence it won't notify other users if they are @mentioned in the chat.
Also, if you have a 1-1 chat with a colleague, and you want to involve a 3rd or 4th person to the conversation you cannot do this right now unless you create a room or join a room, right? But this is about to change soon with a new feature that will be available in a future release! The feature will allow you to add 2+ people in the 1-1 chat. Stay tuned :)
All good things come to an end - thanks to all our customers and partners who have been along the Hipchat and Stride journey with us. As of Feb 15th 2019, Hipchat Cloud and Stride have reached ...
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