Attivazione Defender

Question

Attivazione Defender

Paolo Giacomel 0

Buonasera,

ho un abbonamento Office 365 grazie al quale sto installando MSDefender sui dispositivi del gruppo Family (3 membri). Sul tablet e sul cell di mio figlio compare la scritta "La licenza non è valida. Contatta l'amministratore". Questo problema non è comparso sul PC di mio figlio.

L'età è superiore a 16 anni, ho disinstallato il precedente antivirus, non ho bloccato l'App da Family Safety....non capisco cos'altro debba fare per attivare Defender.

Ringrazio fin d'ora per l'aiuto

Paolo

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Answer 1

Harold Milan 17,605 Consulente indipendente

Hi Paolo,

The message “The license is not valid. Contact your administrator.” typically appears when Defender isn’t able to confirm that the account on the mobile device is properly linked to the shared subscription. Even though your son is over 16 and you’ve already removed any previous antivirus apps, Defender on Android can sometimes misinterpret child accounts or run into issues with how the subscription is recognized on mobile platforms.

Here’s what I recommend trying:

Check Family Sharing and Subscription Status Visit family.microsoft.com and confirm that your son’s Microsoft account is listed under your family group. Then go to account.microsoft.com/services to make sure your Microsoft 365 Family subscription is active and properly shared with him.

Reinstall Defender on the Mobile Devices Uninstall Microsoft Defender from your son’s tablet and phone. Restart the devices, then reinstall Defender from the Play Store. When signing in, make sure to use your son’s Microsoft account not yours.

Avoid Work or School Account Conflicts On the mobile devices, go to Settings > Accounts and check that no Microsoft account is listed as a work or school account. If one is, sign out of it before trying to activate Defender.

Accept Any Setup Prompts After signing in, you may receive a prompt to approve Defender setup for your son’s device. Accepting this helps finalize the activation.

Let me know how it goes I’m here to help

Paolo Giacomel 0 Punti di reputazione

2025-10-15T18:21:50.0466667+00:00
Ciao Harold, ti ringrazio per i suggerimenti!

Ho verificato tutti i punti che hai elencato:

l'abbonamento è attivo

mio foglio compare come membro della famiglia

non ci sono altri account Microsoft nel tablet e nel cellulare

ho disinstallato e reinstallato Defender

Purtroppo ottengo sempre lo stesso messaggio.

Ti sarei grato se avessi altri suggerimenti/controlli da fare e ti ringrazio per i consigli che mi hai inviato

Paolo
Harold Milan 17,605 Punti di reputazione Consulente indipendente

2025-10-15T18:53:50.79+00:00

Hi Again,

Thanks for getting back to me, and I really appreciate the effort you’ve already put into troubleshooting this. I know how frustrating it is to see the same “license not valid. Contact your administrator” message, especially when everything seems to be set up correctly and your son’s PC works without issue.

your Microsoft 365 Family subscription, the app may fail to recognize it due to:

Cached license data on the device

Conflicts with Google Family Link or other device-level restrictions

Outdated app versions or permissions not fully granted

Here are a few additional steps you can try:

Clear Defender App Cache and Data

Go to Settings > Apps > Microsoft Defender

Tap Storage

Select Clear Cache and Clear Data

Reopen Defender and sign in again using your son’s Microsoft account

Check for Google Family Link Conflicts

If Google Family Link is active on the device, it can interfere with Defender’s license validation. Try temporarily disabling or removing Family Link, then reinstall Defender and sign in. You can re-enable Family Link afterward.

Re-add Your Son’s Account to the Family Group

Sometimes refreshing the account link helps:

Go to family.microsoft.com

Remove your son’s account from the group

Re-add it and accept the invitation

Reinstall Defender and sign in again

Use the Official Defender Installer Link

Instead of using the Play Store directly, try installing Defender from aka.ms/AndroidDefender. This ensures you’re getting the latest version optimized for family use.

Let me know how it goes I’m here to help