When you add licenses, you increase the number of total licenses for your existing subscription.
When you renew or extend subscriptions, the number of licenses remains the same, but you extend the amount of time for these subscriptions.
Important
If you choose to add licenses on an existing subscription, the subscription will expire in less than 12 months, depending on the number of existing and added licenses. Once you’ve redeemed a key, you can’t redeem it again. Before you redeem your key, make sure you understand whether you need to add licenses or renew/extend the subscription.