Hello @Sof and @glennterr
Thank you for reaching out to the Community regarding your issue. I'm not sure about the exactly about the card setup from Capital One to Quicken. There's a chance since it's new it might not be available yet but I'm wondering if we might be able to download a QFX file to find out more about the connection.
You can do this by going to the cards website and finding an area where you can download/export transactions. If you can find it and download a QFX file go ahead and import it into Quicken. It may ask you to import it as a new account or might automatically connect to your previous account. Depending on if you're able to do this we can see if we can get any more information on getting it connected through the program again. For more information on Web connect files I'll leave an article down below.
https://www.quicken.com/support/web-connect-troubleshooting
Once you get a chance to try these steps, please let us know what you find. From there we'll better understand our next steps/options.
Thanks,
Quicken Francisco