Virtual Challenge - What is the code to join my challenge? Q: What is the code to join my challenge? All virtual challenges are private by default and accessibly only through privately shared links. Codes are added to virtual challenge by the challenge administrator to further prevent uninvited participants from joining. Participants will need the private link AND the private code in order to join the challenge. Codes can be changed at any time by the challenge administrator. If you are a participant, you will need to contact the challenge administrator for details related to the challenges, like codes, private links, start dates, and activities allowed. Challenge administrators manage these parameters.