I'm here to help you connect your bank account within QuickBooks Online (QBO), @Jbarlhh.
In light of the difficulties you're experiencing with accessing your bank account, please ensure you've chosen the correct Bank account. I recommend contacting your bank to verify the accuracy of your login credentials and avoid possible account lockouts. Check your bank's website for customer service contact information for further assistance.
Therefore, ensure that the steps for connecting your account in QuickBooks Online have been accurately followed. You can check the steps provided below:
Go to Transactions, then select BankTransactions.
Select Link Account.
Enter the URL or name of your bank in the Search field, then select the Bank.
Enter your Sign info in the Login and Password fields, then select Continue.
Select the account you want to connect and the date to pull transactions from the dropdown. Then, choose Next.
Select your account type on the Account type dropdown, then select Next.
Moreover, you can refer to this article to guide you on how to combine multiple transactions into a single record so QuickBooks matches your real-life bank deposits: Record and make bank deposits.
I'm here to help you with any additional inquiries about QuickBooks. Please don't hesitate to inform us on this thread. Have a nice day.
Try opening your QBO account on any private/incognito browser. If the same error persists, you can use MT Online or one of the converter tools (e.g csv2qbo @ $60 one time license) as a workaround.