Step 1: Pick Pathfinder
Step 2: Go to Firing Range and Drop P2020 and ammo
Step 3: Go to the right most entrance (if step 10 does not work go to the left most and try again)
Step 4: Go inside and view the up there should be a ledge as seen in the screenshot below.
Step 5: Grapple onto the ledge. I usually grapple at the corner to make sure I don’t jump off the ledge when I land.
Step 6: Crouch down around the center.
Step 7: Now look down completely until you can’t look further down.
Step 8: Now choose another legend.
Step 9: Pick any hero, for example I have picked Octane here.
Step 10: You should now here a metal clanking sound. When you go back to the training area the bots should now be active and shooting you as seen below.
If you are still having trouble enabling the bots, comment below and I will try to get back to you ASAP.