Thanks for sharing your concern to the thread @Sanpasqual. The issue related to accessing your account has been resolved.

However, since you're still experiencing the issue, I recommend reaching out to our customer support team. They have the necessary tools to help thoroughly investigate the issue. You can reach us through the phone number provided at the bottom of this page: QuickBooks Online Support. You can contact us from Mondays to Fridays, 6 AM to 6 PM PT, and Saturdays, 6 AM to 3 PM PT.

Additionally, you can also check this article to help you change and update your information in QuickBooks Online: Update or change your Intuit Account sign-in information.

You're always welcome to contact us if you have further queries about signing in to your account in QuickBooks.