Hi borisliu,

Welcome to Community!  It's important that you're able to access training tools for QuickBooks Online Accountant certification.  I'd be glad to help!

If you haven't done so already, I recommend clearing cache on your browser.  In addition, I suggest trying other browsers such as Firefox, Edge, Google Chrome or Safari.  You can also access the training modules and webinars within your QuickBooks Online account by following these steps;

1. From the left menu, open ProAdvisor then Training

2. Choose Webinar or Self Paced

If you experience the same behavior, please don't hesitate to contact us.  It would be our pleasure to work with you on a personal level, and ensure you're able to access the training without further delay!

Schedule a Callback or start a Chat: click (?) Help in the upper right in QuickBooks Online > enter "Contact support" > hit Contact Us > provide a brief summary of your situation > hit Let's Talk > choose Get a callback or Start a Chat.

Social Media: Facebook, Twitter, and Instagram.

Support hours are from Monday to Friday between 9 a.m. and 8 p.m. ET.

Feel free to reach out again, if any other questions come to mind.  We'd be happy to assist!