1. From Setup, select the Object Manager.
2. Click on Task.
3. Open an existing task layout or create a new one.
4. Add the Reminder Set field to your Task Detail section of our org’s Task page layouts.
5. Deselect Show simpler New Task form on mobile on the Activity Settings page. The simpler New Task form does not include the options for creating task notifications.The New Task global action does not support task reminders. Push notifications and reminders in the notification tray are not supported in the Salesforce app. While representatives can set and change notification settings in the Salesforce app, they do not receive notifications in it.