It will be my pleasure to help connect your bank account to QuickBooks, @kmartinquilts-gm.
Here are the possible scenarios why you're unable to link your financial institution with QuickBooks:
What you can do is reach your bank and check for any maintenance update or request to establish a connection with QuickBooks. If everything is good from your bank's side, make sure to select the correct bank name when connecting the account.
You'll also want to manually enter transactions to your bank. Please read this article for more information: Manually Upload Transactions into QuickBooks Online.
In addition, you can match transactions that you've entered in QuickBooks. Here's an article for reference: Categorize and Match Online Bank Transactions in QuickBooks Online.
Fill me in if you have other questions about connecting your bank account with QuickBooks. I'll be around to assist you. Have a great day.