The rules of that challenge clearly state that only your own photos are allowed to be submitted, so even if you provided the source, the submission would be invalid.
It appears that you attempted to submit someone else's photo pretending to be the author.
As we have found out that you have a perpetual history of plagiarism fraud or copypasta in the posts, it was like an attempt to defraud in this case too.
The rules of that challenge clearly state that only your own photos are allowed to be submitted, so even if you provided the source, the submission would be invalid.
It appears that you attempted to submit someone else's photo pretending to be the author.
As we have found out that you have a perpetual history of plagiarism fraud or copypasta in the posts, it was like an attempt to defraud in this case too.