VERIFIED SOLUTION i
When attempting to filter communications by ‘Assigned To’, users who are part of the ‘System Administrators’ group are not listed. Search results in '0 results are available'. Refer following screenshot.
It is a known defect untill EngageOne versions 4.4 (SP4).
ResolutionUPDATED: March 1, 2018
This is resolved in EngageOne version 4.4 (SP5).