In the Modern User Experience (UX / MUX), you are not able to use the Conversation feature in Staffing>>Detail>>Conversation. Typing the '@' character does not return any suggestions, even though Staffing - Navigate access rights are granted.
If looked at with Developer tools, it throws a console error
TypeError: Cannot read properties of undefined (reading 'then')
Expected Results: You are able to tag another resource
Actual Results: No resources are suggested for tagging. You will see the error in the Dev tools console. Nothing is logged in the app-ca.log
DE62983
Release : 15.9.3
Component : CLARITY RESOURCE MANAGEMENT
Resolved in Clarity 16.0
Note the following known issue you may see as part of the fix for this issue: New Staffing notification link takes you to the old Staffing workspace