I can see it that Duelbit support USDT, but likely it is on ERC20 network.
Which means Duelbit is not supporting USDT on TRC20? If so, that is not good at all.
It has been August 2 that their official account on this forum is active:
https://bitcointalk.org/index.php?action=profile;u=2859659But you can PM the account, maybe he will get a notification about it.
Sorry I don't know details about Duelbit gambling platform, but how possibilities wit OP available sending USDT TRC from Binance to Duelbit account actually impossible sending using TRC network in Binance to wallet TRC USDT in duelbit. Its seems impossible for sending with address start first 0x as USDT ERC20 network.
But how possibility with OP can get Duelbit deposit address with USDT TRC network if there in duelbit gambling platform not support TRC, drastically difference address kinds between ERC20 and TRC because when wrong kinds of address can't sending fund. I don't understand yet about problem if wrong network usually in exchange platform we need to pay fees service and they will return back our fund.