QB Issue Resolution:

To delete temporary internet files in Internet Explorer

  1. Click the gear icon at the top right of the browser window.
  2. Select Safety.
  3. Click Delete browsing history.
  4. Uncheck Preserve Favorites website data.
  5. Click to mark Temporary Internet Files, then click Delete.
  6. Click OK.
  7. Close all open Internet Explorer windows, restart the browser, go to the sign-in page for QuickBooks Online and try again.