I need help integrating Spot Testnet

I followed the instruction here(https://testnet.binance.vision/) to send request to Spot Testnet API, but I get the error saying bad request
Anybody please help me how to solve this issue

seems like you have reached the request limit; Please try to send the request from a different region.

I tried from different region(US, Serbia, HongKong), but I still get same error