Welcome to the Community - thank you for your question!
Can you confirm that there are no new terms and conditions to agree to, and that your email address is verified within your CapitalOne account?
Thanks for checking that, starbeads.
Can you attempt to update the account by signing into QuickBooks through an incognito (private browsing) window and going to Banking > Pencil icon on bank account > edit sign in-info and completing your banks login info to see if this removes the error.
Thank you for dropping by here in the Community. Allow me to step in and help get rid of the error message when connecting your bank in QuickBooks Online.
Since you're unable to locate any error message from the website, I recommend contacting your Bank Customer Service. One of them will need to check your account and make sure there's no pending message that need's your response.
After getting confirmation, if you continue to get the error message, it would be best to reach out to our Support Specialists this time. They'll need to take over and perform further troubleshooting on your behalf.
You can reach them through these steps:
For future reference in case you're unable to download bank transactions, you can visit this article:
As always, let me know for any additional questions you may concerning your Bank Feeds. The Community will be sure to get back to you.