The API does not find the NFTs

The API does not find the NFTs items. Contract 0x17b6fe1a58cf3231acdec5287b70982b2f75d99b on the Mumbai network (Polygon’s Testnet). Can anyone explain to me why or how to find it?
Follow the NFTs on Opensea: https://testnets.opensea.io/collection/creature-qa6t7f0hbg

Are you sure that is the right address? Shows me an address with no transactions on Mumbaiscan

Thanks Kone! Opensea groups all networks in same screen. Sorry, i did not see. Sorry my fault.