İ Can't login to my accountant access in QuickBooks

I appreciate you providing insights on your current situation and the troubleshooting that you performed, @CrisoCL. I'm here to ensure you can manage your client's account seamlessly.

Please know that as you continue to utilize available browsers to use QBOA and manage clients, it collects temporary internet files that can affect your experience when browsing the program. To determine if it has something to do with what web browser you're using, you'll want to access your account using an incognito browser. Use these shortcut keys to access one:

• Safari 11 or newer: ⌘+Shift+N
• Chrome: Ctrl+Shift+N
• Safari: Command+Shift+N

Once you're ready, go to your account's company and select the client's accountant that you wish to handle. If it goes through, proceed to clear your browser's cache. Check out this article for more details: Clear cache and cookies to fix issues when using QuickBooks Online.

If the issue persists, you can also use other compatible browsers. Refer to this article to see the list of compatible browsers in QuickBooks Online: Other browsers.

Another way to get in touch with our Customer Care Team is through visiting this page: https://quickbooks.intuit.com/learn-support/help/en-us/contact-us

Moreover, you can check out this reference on managing or modifying client's information: Manage clients in QuickBooks Online Accountant.

I'm here to help you if you have other QuickBooks-related questions. Utilize the comment section below to receive a response from me. Take care!

Thank you for your response , But I still can't go through to my client's Quickbooks. I was able to sign in but when I click company it brings me back to sign in page. 

 It seems that the problem is due to my connection to the accountant firm I was Under. When I trained to be Bookkeeper my Mentor added me to her accounting Firm Company where I get my ProAdvisor certificate and even after the training I still connected to that Firm and I used it when I need to access my Client's QuickBooks Account , But It seems that The Company is no longer active since it was for training purposes only , however that's the way I can access to my Client's Quickbooks account , What should I do? 

I appreciate you getting back to this thread, @CrisoCL.

Let's work closely and ensure you can access your client's QuickBooks Online account and get back on track again.

I recommend reaching out to our Customer Support Team. They are equipped with tools to provide assistance with account setup and help troubleshoot any issues related to your connection with the accounting firm. You can directly get in touch with them from this link: https://quickbooks.intuit.com/learn-support/help/en-us/contact-us.

Feel free to read through this handy reference to help you manage your client's books: Open and review clients' QuickBooks Online or Self-Employed accounts.

Moreover, when a client invites you to be their accountant and start a company file for them, you can also be their primary admin. 

Please don't hesitate to reach out again with any questions or concerns about managing your client's accounting data. Achieving your goal is our top priority.