Sorry if your Capital One - Credit Cards is not connecting to your Mint account. I know it could be frustrating. No worries, I'll do my best to help you.
I've noticed that the error indicates a problem related to either changes on your bank's website or your username and password for the account. Since you mentioned you've checked ur Username and Password, and assuming that you can successfully log in directly on Capital One's website, let's try to resolve the issue by doing this:
1. Click the ""Fix It"" button, then ""Edit""
2. Re-enter the login credentials you use to access account on the bank site directly.
However, if issue still persists, please create a ticket via Contact Mint form so we can investigate the issue further.
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