You are ~50m short in the required distance. 50 miles is 80.4672km. You only did 80.41km or 49.96 miles. (1 mile = 1.6093km)
Open the activity in the GCM app (I have Android).
Go to the three dots at the top right of the screen.
open the activity,
adjust the distance by 51 meters extra,
save the activity.
Not quite fair, but it…
You are ~50m short in the required distance. 50 miles is 80.4672km. You only did 80.41km or 49.96 miles. (1 mile = 1.6093km)
This is a very stupid situation! Why didn't the developers specify in the task that the badge is at 80.5 km? I put in so much effort for nothing ( Thanks for your response."
Open the activity in the GCM app (I have Android).
Go to the three dots at the top right of the screen.
open the activity,
adjust the distance by 51 meters extra,
save the activity.
Not quite fair, but it's only about 51 meters.
Enjoy your badge :-)