I appreciate you for reaching out to us, @laceyawalt.
I recognize you want to link your bank to QuickBooks Online. I'm here to assist you with how to fix bank connectivity issues in QuickBooks Online.
We'll attempt to reconnect your bank account in a private window to see if there's a glitch in the regular browser. Please use the shortcut keys provided below:
Google Chrome, press CTRL + Shift + N
Mozilla Firefox: press CTRL + Shift + P
Safari: press Command + Shift + N
If you can connect your bank account, go back to your regular browser and clear the cache to delete stored site data and improve the system's performance. Also, you can use other supported browsers. It could be that the one you're currently working on has a temporary problem with QuickBooks.
Here are a few articles to help you make sure your accounts are accurate and matched.