No, the ability to control notification emails for task assignments in Microsoft Planner is managed by the assignee, not the person assigning the task.

📌 Key Points:

• When a task is assigned, notification emails are sent based on the recipient’s personal settings.
• The assigning user cannot enable or disable these notifications.
• There is no tenant-wide setting to manage this behavior across all users.

🔧 How Assignees Can Manage Their Notification Settings:

1. Go to Microsoft Planner
2. Click the gear icon in the upper-right corner
3. Select “Notifications”
4. Toggle off “Send an email when a task is assigned to me”
5. Click Save