Your UAE account number is the specific numeric identifier assigned by your bank for your individual account, generally used within that bank's own internal systems. Your IBAN (International Bank Account Number) is a longer, standardised code that includes the UAE country code, the bank's identifier, and your account number combined into one internationally recognised format, and it's the IBAN, not the plain account number, that's typically required for both domestic UAE transfers between different banks and any international incoming transfer.
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