Hi @mandecafe,
Unforeseen behaviors or errors are usually caused by the stored files in your browser. When you visit different sites, it keeps the files on your cache so you can easily load the pages next time.
You can provide your employees with some troubleshooting steps to isolate this. This way, we can check if this issue is caused by the browser's stored data.
You can provide these steps to get rid of this error:
- Click the Reload icon or press CTRL + F5 to refresh QBO.
- Try accessing the Workforce in a private window to see if you'll get the same error message.
- If it works in private browsing, clear the cache of your previous browser.
- Restart the browser.
However, if the issue persists, let them try another supported browser.
For more information about the QuickBooks Workforce, you can open this article: Access your paychecks and W-2s online.
I'm just a few clicks away if you need more help with QuickBooks Workforce. Take care.