Ну вот простейший запрос. Который по идее выдаёт список рабочих элементов
1. Get results of a flat work item query.
Sample request
POST https://mytfsserver/DefaultCollection/_apis/wit/wiql?api-version=1.0
{ "query": "Select [System.Id], [System.Title], [System.State] From WorkItems Where [System.WorkItemType] = 'Task' AND [State] <> 'Closed' AND [State] <> 'Removed' order by [Microsoft.VSTS.Common.Priority] asc, [System.CreatedDate] desc" }