You do not need to activate Microsoft 365 Personal again for a new device. On the new device, sign in with the Microsoft account linked to your licence and install Microsoft 365 from your account.
Install Microsoft 365 on a new device
- On the new device, go to office.com/myaccount.
- Sign in with the Microsoft account linked to your Microsoft 365 Personal licence.
- Open “Services & subscriptions”.
- Find Microsoft 365 Personal and select “Install”.
- After installation, open a Microsoft 365 app and sign in with the same Microsoft account.