Welcome to the Community, @jignjic. When you connect your bank account in QuickBooks Online (QBO), we only let you enter the username and password you use for your online banking.
Some banks may require additional security steps before you can connect with them in your QBO. I'd suggest you contact your financial institution (FI) to verify your issue number. Then, continue adding your bank with us.
Check out this help article for more detailed steps: Connect bank and credit card accounts to QuickBooks Online.
For future reference, read through this help article: Match and categorize bank transactions in QuickBooks Online. It helps you learn about reviewing your downloaded transactions so you can add or match them with the one you've already entered.
Feel free to visit again if you have additional questions, @jignjic. We're always delighted to provide you with our utmost help.
