Hello there, Rick.

Let's perform some troubleshooting steps to fix this issue, as it can be caused by problems related to your browser.
 

Corrupted files or data can prevent the system from working properly, which can cause an error when disconnecting your credit card account in QuickBooks Online.
 

To begin, let's refresh your web browser to ensure you are viewing the up-to-date information. If the issue persists, you can use a private or incognito browser to disconnect your credit card. Here are the shortcut keys you can use:
 

• Google Chrome:  Ctrl + Shift + N
• Mozilla Firefox:  Ctrl + Shift + P
• Microsoft Edge: Ctrl + Shift + N
• Safari:  Command + Shift + N

Alternatively, you can switch to another supported web browser for a better experience.
 

Feel free to leave a comment if you have any questions about QuickBooks.