Let's check your browser settings and ensure that third party cookies are not blocked. Follow the steps below to unblock third party cookies depending on the browser you're using.
For Google Chrome:
Select the 3 vertical dots on the top right corner.
Select Settings.
Under Privacy and Security select Cookies and other site data.
Select Allow all cookies under General Settings.
For Safari:
Select Safari on the top left corner.
Select Preferences then Privacy.
Untick Prevent Cross-Site Tracking.
Once done, return to your QuickBooks file. Log out, then log back in. The Employees tab should now load.