Hello there, JaxAl.
With QuickBooks Online (QBO), banking connection issues can be ruled out and resolved with some troubleshooting steps. May I know what error message you've received when connecting your bank to QBO? Any additional information is much appreciated, as this would help me verify further and provide you with an accurate solution to your issue.
In the meantime, we can manually perform some fixes and get things resolved. You can refer to this article to guide you with more detailed information about banking errors: What to do if you get a bank error or can't download transactions in QuickBooks Online. Also, it includes additional steps on how to fix specific bank errors.
Moreover, I've added this reference to guide you on importing your bank transactions to QBO: Troubleshoot issues with Bank Feeds.
You're always welcome to add a comment below if you have additional questions when connecting your bank to QBO. We'd be glad to assist you anytime. Have a good one!
