Hi, JuanAlvalle.  

Have you tried opening your account using an incognito/private browser? If not, we can open your QuickBooks using an incognito/private browser to determine if it's a browser issue. 

The browser's cache saves files on your computer, enabling the website to download faster on your next visit. However, it can also become outdated, leading to website access problems. 

We can open your QuickBooks Online (QBO) account on an incognito window. Doing so will prevent the browser history from being saved.  

Please refer to the following keyboard shortcuts based on your browser type:

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

If the private browsing session works, clear the browser's cache so the system can restart. This task is also possible in other supported, up-to-date browsers. Clearing the cache will reboot the system, allowing you to work with a clean slate. 

However, I suggest contacting our customer support team if the issues persist. Our support team has the necessary tools and expertise to identify the root cause of the problem and provide an effective resolution. They can also check the error message you received during the sign-in and provide detailed guidance on overcoming the issue.  

You can quickly contact our customer support team either by phone or chat. They are available round the clock to assist you with any queries. You can check this article for contact support: https://quickbooks.intuit.com/learn-support/help/en-us/contact-us.

Comment below if you have additional questions about setting up your payroll, and I'll check back in to assist you. Take care!