Can the step count from my phone contribute to the challenge results?
It sure can.
Whether you are using an Apple or Android phone, the step count that your phone records can be added to the challenge results (and the leaderboard if you want to share your results with your colleagues).
To learn how to sync your phone's step data with the Champion Health app, use the articles linked below:
Once you have linked your phone's health app with the Champion Health app make sure to submit your challenge results at the end of each day. That way, all of your daily activity will be accounted for and added to the challenge results.