Did it return with error?
Anyways, it seems to be working if you manually go to the website (without the "/claim") and request coins there,
although there'll be a huge delay between the queue and actual transaction, perhaps the script already put you to the queue.
I wont link the page so that it wont get too many unnecessary requests but you can check the link in Bitcoin's Repo: /master/contrib/signet/getcoins.py.