Step challenge not tracking steps

The March Walking challenge is a distance challenge, not steps.

Record 30 miles of walking activities

Go for daily walks or get moving a few times a week. Just complete 30 total miles (48.3 km) of walking activities this month to win the challenge badge.

As seilogramp wrote: That challenge is not a steps challenge.

It is a walking challenge so you must log your walking as walking. I see that you've logged a hiking activity. Hiking is not a walking activity.