Adding any emoji as a reaction remains under review.
I am marking this as partially done to let you know a new reactions bar with Like, Heart, Laugh, Surprised, Sad, and Angry has begun rolling out to all users.
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@Alex Can you also considering one emoji for Done expression. As the teams collaborate they don't need to type anything ... someone ask something .. We can directly use the Done expression that's the task completed as this is mostly used between Teams at work