On-Prem: Project "Add existing User" gives "Loading" indicator and never shows users

Document ID : KB000096876
Last Modified Date : 17/05/2018
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After navigating to a project and attempting to add a new user to the project using the "Add existing User" button, the "Loading" indicator is shown but no users are listed.
Agile Central On-Premise 2018.1
Internet Explorer 11
This is a known issue in 2018.1.

The current workaround is to use another browser such as Chrome or Firefox.