It seems you are referring to QuickBooks Online account, and there are several reasons why you can't access your account. Let me guide you through some troubleshooting steps.

The first thing we need to do is ensure that you are connected to the internet and that the connection remains stable. Then, double-check your username and password and log in again.

If you are using QuickBooks Self-Employed, then use this link: QBSE log in.

Then, let's open your account using an incognito window to eliminate the possibility of a webpage issue. Here are the following keyboard shortcuts:
 

• Google Chrome and Microsoft Edge: Ctrl+ Shift + N
• Mozilla Firefox: Ctrl + Shift + P
• Safari: Command + Option + P
  
  

If the issue persists after doing so, we can assist you in recovering your account. Please visit this article for more information and detailed steps on how to recover your account: Recover your Intuit Account.

Additionally, you can check this link about how to manage, change, or renew your Intuit subscriptions and add-ons: Subscription management.

Moreover, you can maximize the efficiency of your financial processes by collaborating with our QuickBooks Live Expert Assisted team. They're veterans in the field, known for smoothing out financial operations and offering insights tailored to your business. One click connects you to a more prosperous financial path.

If you need further assistance in managing your account in QuickBooks, just click the reply button. I'm always here to help.