Cloud GET /v1/user-service/my/tasks endpoint 'after' parameter not working

Hi, I've tried calling the documented GET /v1/user-service/my/tasks endpoint, and found that it works as I expect with the 'limit' and 'deviceId' parameters. But not the 'after' parameter. I've tried assuming it might accept a number of records (e.g. 10) or a task Id (e.g. 1234543) but neither has any effect on the tasks returned. Can you confirm in what form you found success with it?