Error "There is another user group with the same name" while Create a Chat Queue for field "Name this Queue"

Was doing the challenge for https://trailhead.salesforce.com/content/learn/projects/set-up-the-service-console/set-up-web-chats-for-your-console?trailmix_creator_id=strailhead&trailmix_slug=prepare-for-your-salesforce-administrator-credential and had a problem while trying to input "Chat Agent" under field "Name This Group" for "Create a Chat Queue" as per screenshot below.  I've checked under "Public Groups" and "Queue" and cannot find the record "Chat Agent". Appreciate if someone can assist.