I understand how inconvenient it must be to run into trouble signing in, Jayne. One quick step we can try to resolve this issue is clearing your browser's cache.
Outdated or corrupted files stored by the browser can sometimes interfere with website functionality, including the sign-in process. Clearing the cache can refresh your browser and potentially fix the problem, allowing you to sign in without further trouble.
Alternatively, you can also use another supported browser for optimal compatibility with QuickBooks.
If you have any additional questions, please don't hesitate to reply. We're here to help.