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1. Please understand that there are many USDT under different blockchain , Such as Omni USDT stay in Bitcoin blockchain, USDT (ERC20) stay in Ethereum network, and USDT (bep20), USDT (TRC20). The different chain can not just transfer directly , as you described , You transfer Omni USDT to Ethereum network USDT address, Of course it’s not working. You can only transfer another USDT omni address (same with BTC address )