Fix Microsoft Defender Invalid License on Child's Android Device
Question details
The user needs to resolve an 'Invalid License' error in Microsoft Defender on a child's Android device, despite the account being part of an active Microsoft 365 Family subscription.
- Product
- Microsoft Defender
- Device & OS
- Android
- Scenario
- Setting up Microsoft Defender on a child's Android device using a Microsoft 365 Family subscription.
- Observed behavior
- The Microsoft Defender app opens and has the required permissions, but it refuses to accept the license and displays an Invalid License error, even though other apps like OneDrive work perfectly.
Ensure the Android device has a stable internet connection and that the child's Microsoft account is actively listed in your Microsoft 365 Family group.
Verify Family Settings and Clear Defender App Cache
Confirm the child's account status in the Microsoft Family group and clear the local app cache to force a license refresh on the Android device.
Sometimes the local cache on the Android device fails to sync properly with the Microsoft 365 subscription backend. Clearing this data and logging in again can refresh the entitlement.
On the parent's device, log into your Microsoft account and verify that the child is still listed under your Microsoft Family group and is eligible for Microsoft 365 benefits.
Open the Microsoft Defender app on the child's Android device and sign out of the current Microsoft account.
Navigate to the Android device's Settings > Apps > Microsoft Defender > Storage, and tap 'Clear Cache'.
Re-open Microsoft Defender and sign back in using the exact Microsoft account associated with the child's Family group profile.
Reinstall Microsoft Defender and Grant Permissions
A clean installation can resolve corrupted local license files and ensure all necessary device permissions are properly granted.
Manage Your Family's Documents Easily with WPS Office
While troubleshooting Microsoft subscriptions, consider switching your family's document management to WPS Office. It's a lightweight, free alternative to Microsoft Office that works seamlessly on Android, Windows, and Mac, without complicated family licensing restrictions.
Frequently Asked Questions
Why does Microsoft Defender say my child's license is invalid?
This usually happens when the child's Microsoft account fails to sync properly with the Microsoft 365 Family subscription entitlement on the backend, or if there is a corrupted cached login on the Android device.
Does my child need a separate subscription for Microsoft Defender on Android?
No. As long as the parent has an active Microsoft 365 Family subscription and the child is added to the Microsoft Family group, they are fully entitled to use Microsoft Defender across their devices.
How do I check if my child is correctly added to my Microsoft Family group?
Log in to family.microsoft.com using your parent account credentials. You will see a dashboard listing all connected family members. Ensure your child's account is listed there with active benefits.
