@Jean: To better understand your problem, we will need more information. Can you provide answers to these questions:
- What is the version of PI Notifications that you use?
- Can you attach to the thread the PI SDK message log file where the PI Notifications Scheduler/Analytic Processor is installed?
- Have you tried to recover the return value of the StopNotification method? It returns true or false based on success.
- Have you verified the credentials of your application? It may not have the rights to stop/handle the notification instances.