There are some coins that are supported on multiple blockchains. For example, you can have USDT holdings in an Ethereum Wallet, a Binance Smart Chain Wallet, a Tron Wallet, etc.

When you try to add a USDT address, make sure that you add the correct one. For example, if it runs on the Ethereum Blockchain make sure you choose the ERC-20 USDT option. If it's on the Binance Smart Chain, choose the BEP-20 option.

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