Workflow tasks status cannot be edited in Xflow interface, the dropdown is not displayed, it only shows the existing status, Service Desk interface allow the edition of the workflow status without issue, also there are no errors in the application or logs of Xfow or Service Desk.
The configuration for the workflow status field was set to read only in the configuration settings of the Xflow interface on Service Desk
Release : 17.2
Component : XFLOW INTERFACE FOR SDM
Modify the configuration settings as follow