Hello there, @BAP.

I'm here with you today to help check why you can't access your account.

If you're trying to log in to your QuickBooks Online (QBO) account/company, it's possible that your browser's cache is bogged down with older data which may cause the issue. To verify this further, first, you may need to access your account using a private browser and check if you'll be able to sign in successfully from there.

To access your account using a private browser, you may use either of these shortcut keys:

• Google Chrome, press CTRL  + Shift + N
• Mozilla Firefox: press CTRL  + Shift + P
• Internet Explorer: press CTRL  + Shift + P
• Safari: press Command + Shift + N

If it works successfully using the private browser, access your account using the original browser and clear the cache. In addition, using another supported browsers can also help us narrow down the cause of this unexpected behavior.

If the issue continues, I recommend getting in touch with our Support Team to check and investigate this further securely. For the support's contact information, you may check it here: Contact the QuickBooks Online Customer Support team.

In case you have any other QuickBooks concerns, you may check our help articles for your future reference: QBO help articles.

Please don't hesitate to add a post/comment below if you have any other QuickBooks questions, I'll be right here to help you however I can. Wishing you the best!