Error: Requested a new preference but one already exists for this notification and device

[lonesoac01]

I have a user that is trying to unsubscribe from this notification but cannot due to this error code.  How can I diagnose and resolve this issue?

[Tanushree Maiti]

Hi @lonesoac01 

Refer KB: KB2582963 Duplicate Custom Notification Subscription Fails with "Unable to Update Preferences" Error 

Resolution

Review existing subscriptions in the sys_notif_subscription table to confirm whether a subscription already exists for the notification.

Instead of creating a new subscription, modify the existing one to update filters or delivery channels as required.

This is expected system behaviour as per ServiceNow’s notification subscription design