Congratulations on your new account with QuickBooks, Britton.
I want to make sure you'll be able to connect your business bank account with QuickBooks Online.
Let's perform basic troubleshooting steps to check whether this has something to do with your browser. You can use an Incognito browser or a new private window.
Here's how to open a private window in different browsers:
Google Chrome: press Ctrl + Shift + N.
Mozilla Firefox: press Ctrl + Shift + P.
Internet Explorer: press Ctrl + Shift + P.
Safari: press Command + Shift + N.
If you're able to connect your bank via the private browser, let's go back to your regular browser and clear its cache. The cache can become bogged down with excess data, therefore slowing down the system.
You'll be back to business in no time. Please know I'm only a post away if you have any other questions. Have a nice day!
It's good to know that you've tried the troubleshooting steps provided by my colleague @RoseMarjorieA above. Those steps can generally resolve Online Banking issues in QuickBooks Online.
Since you're still getting the same error message, we need to take a look into your account. However, I won't be able to do that without asking your account details.
The Community is a public forum, so I don't want your details displayed here for security purposes. I recommend giving our QuickBooks Online Customer Care a call. They have the necessary tools to help you investigate the cause of this error.
We'll make sure you can connect the Fifth Third bank account to QuickBooks Online.
Feel free to reach out to me again if you have any other questions and I'm here to help you. Have a good one.