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Hi Alison - All looks OK in the screenshot. I am sensing there is a white space in your post to Support group. Please check if there is any and also add the URL on the next line (after hitting Enter on your keyboard). Steps below. Let me know if this helps
1.) Copy "Hi Support people! Here is some quick training on how to use the @mention feature, to bring another user or even an entire group into a Chatter conversation"
2.) Ensure there are no white spaces
3.) Hit Enter
4.) Paste the URL
5.) Try verifying the challenge
