If you have an IBAN account you can check the account online here.
Most likely you have entered your local bank account and not the IBAN account number (the international account ID together with the BIC/SWIFT). If you can’t it your web bank, you will have to contact your own bank to get it.
More info about IBAN/SWIFT/BIC can be found here.
Some countries do not support IBAN/SWIFT/BIC, like the USA, and in these cases you will need to ask your own bank for guidance.