Welcome to the Community, @drspedale and @cmfrazier.
Let's perform some troubleshooting steps so you'll be able to reconcile your Capital One credit card account.
First off, let's try updating your credit card account from the Banking page. Here's how:
- Click Banking from the left menu.
- At the top-right section of the page, click Update.
- If prompted, enter your Multi-Factor Authentication (MFA) credentials and select Continue update.
Once done, try to reconcile the account again to double-check.
If the same thing happens, let's try logging in to your QuickBooks Online account using a private browser. If it works, go back to your original browser and clear your browser's cache to clean some stored data.
If the issue persists after performing the steps, I'd suggest contacting our Phone Support Team. This way, they can further investigate this matter and create an investigation ticket if other users are experiencing the same.
You might want to read this article to learn more about reconciling an account: Learn the reconcile workflow in QuickBooks.
Please keep in touch if there's anything else I can do to help you succeed with QuickBooks. I've got your back. Have a great day and be safe.