It's my priority for you to log in to your QuickBooks Online (QBO) account, haris arif. 

We can perform some basic troubleshooting steps to make sure the issue isn't browser-related. It's possible that the local internet cache files are the reason for the unexpected behavior. 

Let's access your account using a private window to fix this. This is a good place to determine if there's an issue with the browser. Here are the keyboard shortcuts:

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

Once logged in, try logging in to your account. If it works, let's clear the browser's cache to ensure the program performs efficiently. Otherwise, you can use other supported browsers. They also provide the best and most secure experience with QuickBooks. 

I've added this article to learn more about managing users: Add and manage users in QuickBooks Online.

Feel free to comment below if you need further assistance logging in to your account. I'll be here to help you.