Workforce for ArcGIS removed support for Internet Explorer 11 with the Fall release of ArcGIS Online. With the Enterprise 10.8 release, Workforce for ArcGIS no longer supports Internet Explorer 11.
If you prefer, or are required to use, a Microsoft browser, Microsoft Edge is available and supported by Workforce for ArcGIS.
Additionally, Workforce for ArcGIS continues to support the browsers listed under the system and device requirements. See the Related Information section below.