Expenses approval - Workflow activation

Hi All - While working with the expense management module in 9.2, after submitting expense reports (P09E2011) the Report ID is getting correctly routed for approval as per Rules definition, however, we keep receiving the "Active Workflow Task for ID XXXXX not found" at the time of manager approval.

Distribution list (P02150) and employee profile is correctly setup under the same structure type (ES). Manager receives the approval email but no action can be submitted. Report ID remains at status 210 for approval but we cannot identify what else can be missing.

Any help or example on how to complete workflow / DL for expenses will be useful to continue working on this.