Good morning, @ed-mccutcheon! I'm happy you reached out to the Community with your question. Just to clarify, are you trying to connect your Apple Card to your QuickBooks Online account?
If that's correct, it's worth mentioning that Apple card isn't an available option in online banking yet. However, you can still bring in those transactions manually. Once you download your Apple Card transactions as a CSV file, you can upload them to your account. Here's how:
On the Banking page, click the arrowicon beside Link account.
Choose Upload File.
Click the Browsebutton under Select a File to Upload.
Browse for the CSV file you've downloaded from Apple Card.
Another thing you can do in the meantime is submit a request that QuickBooks add Apple Card in the future.
Go back to the Banking tab, then click the Link Account button.
Select Connect to Bank and then type Apple card in the search bar (or use Apple Card's browser mode link).
Scroll down until you see the Still can't find your bank? link.
Click there and enter the Bank Name and the web address.
If you have any questions or need help with any of these steps, don't hesitate to follow up with me here. :)