Possible reasons:
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Network delay: Blockchain confirmations can take longer during high traffic.
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Wrong coin or network: Sending USDT-ERC20 to a TRC20 address will not credit.
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Insufficient confirmations: Check your TXID in a block explorer.
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Deposit below minimum: Tiny deposits may not credit.
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Exchange withdrawal delay: Some exchanges process withdrawals in batches.
✅ What to do:
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Check the TXID in a blockchain explorer.
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Verify the coin and network used.
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Wait a bit longer if still unconfirmed.
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If confirmed but not showing after an hour, contact support with the TXID.