Holy thread necro I started reading it and saw my own reply at the beginning!
Are you honestly that surprised? No volunteer organisation in the world is going to assign someone a job to do on their own in isolation outdoors. You presumably weren't turned down because you were volunteering on your own, but I guess you said you didn't want to work alongside any other volunteers?
I was recently turned down for a volunteering role as I was told lone(r) volunteers are not permitted. All volunteers must be accompanied by two members of staff at all times, and groups go out in teams of 10 or so. And the staff members have to be qualified first aiders and yadda, yadda.
It was an ourdoorsy naturist role. 'Elf and safety don't permit volunteers to work alone, in case they get attacked by man-eating squirrels, or something.
Are you honestly that surprised? No volunteer organisation in the world is going to assign someone a job to do on their own in isolation outdoors. You presumably weren't turned down because you were volunteering on your own, but I guess you said you didn't want to work alongside any other volunteers?