I understand how important it is to successfully connect your bank account to QuickBooks Online, gnahikian. I'm here to help you with that.
When you set up online banking, the system will ask you to enter the username and password you use for your bank's website. Thus, I'd suggest making sure you've connected to the correct bank.
If your financial institution has multiple names on our list, you can search your bank by entering their URL to ensure you are using the correct listing. For more details about this, please see this article: Find your Bank or Credit Card Account When you Connect to Online Banking.
Additionally, I've included these articles that'll help you in ensuring your bank transactions are reviewed and categorized accurately in QuickBooks Online:
I'm only a post away if you need more help in completing your banking tasks in QuickBooks, gnahikian. It's always my pleasure to help you out again.