I’ll help you get to the bottom of this issue, @bradmef.
If you’ve added multiple credit cards with the same bank in your QuickBooks Online, it’s possible you’ll encounter this error message.
Before connecting to Online Banking, identify how your bank sends your downloaded transactions. If they download transactions to only one, you connect the parent account. If it downloads to each of the individual accounts, you would attach all of the sub-accounts.
Follow the steps below to connect your credit card:
1. Click the Gear icon and select Chart of Accounts.
2. Locate the bank account to connect.
3. From the Action column, click View Register.
4. Select Connect bank.
5. Follow the prompts to connect your bank account.
Check out this article for more information: About bank or credit card sub-account setup.
That should do it, @bradmef. Let me know how it goes by leaving a comment below. I’ll be here to answer if you have any questions. Enjoy your day!