Hey Ashley,
On your Android device when creating a new checklist item, are you able to manually enter the @mention username of the board member? The Android version of Trello doesn't automatically populate the @ symbol and populate a list of board members that you could mention, but you should be able to manually type an @ mention name of a board member within the checklist item.
If something doesn't seem right, could you share a screenshot and your Android device version and Trello app version?
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