Unable to make a MARKET order on Futures Test Network. 404 Not found.

I am testing the market order on futures testnet my params:

   symbol=BTCUSDT
   side=SELL
   type=MARKET
   quantity=1

The returned value is

Error: 404 Not Found <html><body><h2>404 Not found</h2></body></html>

Any suggestions?

Can you share the endpoint you used?