Invoice approval email notifications sent multiple times for approval groups with more than 1 app

Summary:

Invoice approval were created using "Workflow Rules in Spreadsheet". noticed that email notifications are sent multiple times if the approval group contains more than one approver.

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Have set Task Notifications in BPM to:

Don't send multiple notifications for the same human task event is checked

Group Notification Configuration = Send one email containing all email addresses

Task Aggregation = Once per stage