The Twitch UI doens’t provide “reactions” so I’m not sure what you are trying to do in order to collect “reactions”.
A reaction might be a “chat message” or it might be “someone sent an emoji” or someone put a emojio against a comment on a youtube video (to use a youtube example)
I have no idea what a “reaction” is on Twitch to direct you.
But if this is part of a hiring process, then they might be testing to see what you suggest a “reaction” could be.