This issue can occur if a pop-up window is blocked, Jodi. Let's check your pop-up blocker settings and troubleshoot them so you can upload your tax notice successfully.
Note: The steps may vary depending on your browser version.
If you're using Google Chrome, please follow these steps:
Open Chrome, select More, then select Settings.
Select Advanced.
Under Privacy and security, choose Content settings.
Select Pop-ups and redirects.
Switch the setting to Allowed or Blocked.
(Optional) If you prefer to keep pop-ups blocked, add an exception for QuickBooks Online instead: