I cannot resolve a bank connection error message.

Try opening your QBO account on any private/incognito browser.

I appreciate you performing some troubleshooting steps to resolve the error you received, @drbowers.

I'll provide additional information to help you overcome bank error 324 so you can download and manage your transactions seamlessly.

Before anything else, may I know the bank you're connecting with QuickBooks? If this is American Express, you must download bank transactions from cards with their name as they tightened their security requirements. Otherwise, you'll receive error 324.

On the other hand, error 324 in QuickBooks Online means the software can't recognize your account upon connecting to your financial institution's website. The reasons for these are:

• Your bank or credit card company has relocated your account to a new server.
• You updated your account details on your bank or credit card company's website.
• You change your bank information on the bank company's website.
• It seems that you have been issued a new account or credit card by your bank or credit card company.
• You have closed either your bank or credit card account.
• It appears that you have multiple bank accounts under the same name.

To resolve the error and continue downloading transactions, follow the steps below:

1. Open your QuickBooks Online account.
2. Head to Transactions and choose Bank transactions.
3. In the upper right corner, click on Update.
4. If the same error appears, find the banner on the banking page.
5. From there, select Check Connections and proceed to the steps on fixing the issue.

For more information about the different processes to overcome the issue, please refer to this article: Fix banking error 324 in QuickBooks Online and QuickBooks Self-Employed.

Moreover, consider scanning these resources to have a guide when you encounter another type of banking error:

• Fix bank upload errors in QuickBooks Online
• What to do if you get a bank error or can't download transactions in QuickBooks Online

If you have additional questions regarding the banking error 324, you can always click the Reply button to keep us updated in the thread. We're here to help.

You stated:  

I'll provide additional information to help you overcome bank error 324 so you can download and manage your transactions seamlessly.

Before anything else, may I know the bank you're connecting with QuickBooks? If this is American Express, you must download bank transactions from cards with their name as they tightened their security requirements. Otherwise, you'll receive error 324

I am using AMEX. It lost the connection. I was able to reconnect the main account number, but I have 3 cards linked to the account. Now all the transactions are coming through under one account in the Bank Transactions. How do I get it back to see the transactions separately like they have been the past 3 years?

Welcome to the Community, @BrokenCars.

Currently, there is an ongoing investigation about the American Express parent bank account that is pulling  transactions from wrong accounts in QuickBooks Online. Rest assured that our Engineering Team is dedicated to working for them to implement a solution that will fix this issue.

Please know that this is a top priority for us. It will continue to be so until resolved.

I encourage you to contact our Phone support team. They can add you to our notification list, and you'll receive an email notification once an update is available. 

Here’s how:

1. Sign-in to your QuickBooks Online company.
2. Click Help (?).
3. Select Assistant tab to get started and get quick, personalized answers. Select a suggested option or type a question or topic you need help with. If you decide you need further help, you can still Talk to a human.

You can then choose a way to connect with us:

• Start a chat with a support expert.
• Get a callback from the next available expert.

For future reference, you can read this article about reconciliation: Reconcile an account in QuickBooks Online.

Feel free to click the Reply button below if you have questions about managing bank transactions in QuickBooks Online. I'm always here to help. Have a great day.

I am having the same problem, did you ever get this problem resolved?  If so, what did you do?

Good day, HJPoliskey.

It's my pleasure to provide the help you need with your banking concerns. To do so, I need more information regarding the problem you experienced.

I'd like to know if you encountered the same error 324. Are there any changes with the bank account where your transactions come from? Do you have a parent account with subaccounts?

Please know any additional details would help us narrow down the issue. I'll be on the lookout for your response.