I think you are confused.
That image is from two years ago and doesn’t have the right tags for the collaboration, and doesn’t have a transparent background, Also it was never submitted for this collaboration.
Please re-read the first post in this thread.
If your Oc was in a group shot, what was the image in which your OC appeared, please?
Wait - figured it out. This happened last year, too. I’ve reached out to Joey for help IDing the people and artists in the group shot you were in.