QuickBooks Issue 323 is a banking error in QuickBooks Online that occurs when you add the same bank account twice or when your financial institution does not accept the sign-in credentials that you have entered. What Causes QuickBooks Error 323? Examine the following list of QuickBooks error code 323 causes: If you have two accounts that have the same account name and account number (the last four digits of the account number are the same). When you add the same account more than once. Solutions for QuickBooks Error 323 Examine the strategies below to resolve QuickBooks Online Error 323 Solution: On the bank's website, rename one of the accounts. Select Banking from the navigation bar. Choose the account you wish to rename. Choose Edit > Edit account information. Select Disconnect this account on save in the Account Window. Select Save Conclusion: If QuickBooks Error 323 persists and the remedies provided above do not work, please contact us. Then, contact us right away at our QuickBooks Error Support.