USDT TRC20 Deposit Not Credited on KuCoin
A KuCoin deposit that hasn't shown up is usually either still pending on-chain or already confirmed and waiting on KuCoin's own crediting step.
Check on-chain first
Search the transaction hash on TronScan. If it shows SUCCESS to the correct KuCoin deposit address, the funds are already there from the network's perspective, and you're waiting on KuCoin's processing.
Address and network mismatch
Make sure the deposit address you used was specifically generated for the TRC20 network on KuCoin — reusing an old address generated for a different network is a common source of confusion.
Contacting KuCoin
With a confirmed on-chain SUCCESS and a delay beyond the usual few minutes, contact KuCoin support with the transaction hash so they can trace it on their internal systems.