Update: This issue was corrected in the Q2 2019 HRMS quarterly release that was released on 6/19/2019.
Yesterday the ISCM for Sage 100 2019 was supported. Sage HRMS is currently not supported with Sage 100 2019. The Sage HRMS team is working on a resolution, and we expect the correction will be available this quarter. When that correction is available, the ISCM will be updated again to include Sage HRMS.