You currently have {0} user licenses, but you've entered product keys for only {1} user licenses. If you want to keep {0} ...

You currently have {0} user licenses, but you've entered product keys for only {1} user licenses. If you want to keep {0} user licenses only, click cancel and enter more product keys. 
If you choose to continue, {2} user licenses will be removed and the subscription end date for the {1} remaining user licenses will be extended.